1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2001 Atsushi Onoe
5 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #include "opt_inet.h"
31 #include "opt_inet6.h"
32 #include "opt_wlan.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/mbuf.h>
39 #include <sys/endian.h>
40
41 #include <sys/socket.h>
42
43 #include <net/bpf.h>
44 #include <net/ethernet.h>
45 #include <net/if.h>
46 #include <net/if_var.h>
47 #include <net/if_llc.h>
48 #include <net/if_media.h>
49 #include <net/if_private.h>
50 #include <net/if_vlan_var.h>
51
52 #include <net80211/ieee80211_var.h>
53 #include <net80211/ieee80211_regdomain.h>
54 #ifdef IEEE80211_SUPPORT_SUPERG
55 #include <net80211/ieee80211_superg.h>
56 #endif
57 #ifdef IEEE80211_SUPPORT_TDMA
58 #include <net80211/ieee80211_tdma.h>
59 #endif
60 #include <net80211/ieee80211_wds.h>
61 #include <net80211/ieee80211_mesh.h>
62 #include <net80211/ieee80211_vht.h>
63
64 #if defined(INET) || defined(INET6)
65 #include <netinet/in.h>
66 #endif
67
68 #ifdef INET
69 #include <netinet/if_ether.h>
70 #include <netinet/in_systm.h>
71 #include <netinet/ip.h>
72 #endif
73 #ifdef INET6
74 #include <netinet/ip6.h>
75 #endif
76
77 #include <security/mac/mac_framework.h>
78
79 #define ETHER_HEADER_COPY(dst, src) \
80 memcpy(dst, src, sizeof(struct ether_header))
81
82 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *,
83 u_int hdrsize, u_int ciphdrsize, u_int mtu);
84 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int);
85
86 #ifdef IEEE80211_DEBUG
87 /*
88 * Decide if an outbound management frame should be
89 * printed when debugging is enabled. This filters some
90 * of the less interesting frames that come frequently
91 * (e.g. beacons).
92 */
93 static __inline int
doprint(struct ieee80211vap * vap,int subtype)94 doprint(struct ieee80211vap *vap, int subtype)
95 {
96 switch (subtype) {
97 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
98 return (vap->iv_opmode == IEEE80211_M_IBSS);
99 }
100 return 1;
101 }
102 #endif
103
104 /*
105 * Transmit a frame to the given destination on the given VAP.
106 *
107 * It's up to the caller to figure out the details of who this
108 * is going to and resolving the node.
109 *
110 * This routine takes care of queuing it for power save,
111 * A-MPDU state stuff, fast-frames state stuff, encapsulation
112 * if required, then passing it up to the driver layer.
113 *
114 * This routine (for now) consumes the mbuf and frees the node
115 * reference; it ideally will return a TX status which reflects
116 * whether the mbuf was consumed or not, so the caller can
117 * free the mbuf (if appropriate) and the node reference (again,
118 * if appropriate.)
119 */
120 int
ieee80211_vap_pkt_send_dest(struct ieee80211vap * vap,struct mbuf * m,struct ieee80211_node * ni)121 ieee80211_vap_pkt_send_dest(struct ieee80211vap *vap, struct mbuf *m,
122 struct ieee80211_node *ni)
123 {
124 struct ieee80211com *ic = vap->iv_ic;
125 struct ifnet *ifp = vap->iv_ifp;
126 int mcast;
127 int do_ampdu = 0;
128 #ifdef IEEE80211_SUPPORT_SUPERG
129 int do_amsdu = 0;
130 int do_ampdu_amsdu = 0;
131 int no_ampdu = 1; /* Will be set to 0 if ampdu is active */
132 int do_ff = 0;
133 #endif
134
135 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
136 (m->m_flags & M_PWR_SAV) == 0) {
137 /*
138 * Station in power save mode; pass the frame
139 * to the 802.11 layer and continue. We'll get
140 * the frame back when the time is right.
141 * XXX lose WDS vap linkage?
142 */
143 if (ieee80211_pwrsave(ni, m) != 0)
144 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
145 ieee80211_free_node(ni);
146
147 /*
148 * We queued it fine, so tell the upper layer
149 * that we consumed it.
150 */
151 return (0);
152 }
153 /* calculate priority so drivers can find the tx queue */
154 if (ieee80211_classify(ni, m)) {
155 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT,
156 ni->ni_macaddr, NULL,
157 "%s", "classification failure");
158 vap->iv_stats.is_tx_classify++;
159 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
160 m_freem(m);
161 ieee80211_free_node(ni);
162
163 /* XXX better status? */
164 return (0);
165 }
166 /*
167 * Stash the node pointer. Note that we do this after
168 * any call to ieee80211_dwds_mcast because that code
169 * uses any existing value for rcvif to identify the
170 * interface it (might have been) received on.
171 */
172 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
173 m->m_pkthdr.rcvif = (void *)ni;
174 mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1: 0;
175
176 BPF_MTAP(ifp, m); /* 802.3 tx */
177
178 /*
179 * Figure out if we can do A-MPDU, A-MSDU or FF.
180 *
181 * A-MPDU depends upon vap/node config.
182 * A-MSDU depends upon vap/node config.
183 * FF depends upon vap config, IE and whether
184 * it's 11abg (and not 11n/11ac/etc.)
185 *
186 * Note that these flags indiciate whether we can do
187 * it at all, rather than the situation (eg traffic type.)
188 */
189 do_ampdu = ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) &&
190 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX));
191 #ifdef IEEE80211_SUPPORT_SUPERG
192 do_amsdu = ((ni->ni_flags & IEEE80211_NODE_AMSDU_TX) &&
193 (vap->iv_flags_ht & IEEE80211_FHT_AMSDU_TX));
194 do_ff =
195 ((ni->ni_flags & IEEE80211_NODE_HT) == 0) &&
196 ((ni->ni_flags & IEEE80211_NODE_VHT) == 0) &&
197 (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF));
198 #endif
199
200 /*
201 * Check if A-MPDU tx aggregation is setup or if we
202 * should try to enable it. The sta must be associated
203 * with HT and A-MPDU enabled for use. When the policy
204 * routine decides we should enable A-MPDU we issue an
205 * ADDBA request and wait for a reply. The frame being
206 * encapsulated will go out w/o using A-MPDU, or possibly
207 * it might be collected by the driver and held/retransmit.
208 * The default ic_ampdu_enable routine handles staggering
209 * ADDBA requests in case the receiver NAK's us or we are
210 * otherwise unable to establish a BA stream.
211 *
212 * Don't treat group-addressed frames as candidates for aggregation;
213 * net80211 doesn't support 802.11aa-2012 and so group addressed
214 * frames will always have sequence numbers allocated from the NON_QOS
215 * TID.
216 */
217 if (do_ampdu) {
218 if ((m->m_flags & M_EAPOL) == 0 && (! mcast)) {
219 int tid = WME_AC_TO_TID(M_WME_GETAC(m));
220 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[tid];
221
222 ieee80211_txampdu_count_packet(tap);
223 if (IEEE80211_AMPDU_RUNNING(tap)) {
224 /*
225 * Operational, mark frame for aggregation.
226 *
227 * XXX do tx aggregation here
228 */
229 m->m_flags |= M_AMPDU_MPDU;
230 } else if (!IEEE80211_AMPDU_REQUESTED(tap) &&
231 ic->ic_ampdu_enable(ni, tap)) {
232 /*
233 * Not negotiated yet, request service.
234 */
235 ieee80211_ampdu_request(ni, tap);
236 /* XXX hold frame for reply? */
237 }
238 /*
239 * Now update the no-ampdu flag. A-MPDU may have been
240 * started or administratively disabled above; so now we
241 * know whether we're running yet or not.
242 *
243 * This will let us know whether we should be doing A-MSDU
244 * at this point. We only do A-MSDU if we're either not
245 * doing A-MPDU, or A-MPDU is NACKed, or A-MPDU + A-MSDU
246 * is available.
247 *
248 * Whilst here, update the amsdu-ampdu flag. The above may
249 * have also set or cleared the amsdu-in-ampdu txa_flags
250 * combination so we can correctly do A-MPDU + A-MSDU.
251 */
252 #ifdef IEEE80211_SUPPORT_SUPERG
253 no_ampdu = (! IEEE80211_AMPDU_RUNNING(tap)
254 || (IEEE80211_AMPDU_NACKED(tap)));
255 do_ampdu_amsdu = IEEE80211_AMPDU_RUNNING_AMSDU(tap);
256 #endif
257 }
258 }
259
260 #ifdef IEEE80211_SUPPORT_SUPERG
261 /*
262 * Check for AMSDU/FF; queue for aggregation
263 *
264 * Note: we don't bother trying to do fast frames or
265 * A-MSDU encapsulation for 802.3 drivers. Now, we
266 * likely could do it for FF (because it's a magic
267 * atheros tunnel LLC type) but I don't think we're going
268 * to really need to. For A-MSDU we'd have to set the
269 * A-MSDU QoS bit in the wifi header, so we just plain
270 * can't do it.
271 */
272 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) {
273 if ((! mcast) &&
274 (do_ampdu_amsdu || (no_ampdu && do_amsdu)) &&
275 ieee80211_amsdu_tx_ok(ni)) {
276 m = ieee80211_amsdu_check(ni, m);
277 if (m == NULL) {
278 /* NB: any ni ref held on stageq */
279 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
280 "%s: amsdu_check queued frame\n",
281 __func__);
282 return (0);
283 }
284 } else if ((! mcast) && do_ff) {
285 m = ieee80211_ff_check(ni, m);
286 if (m == NULL) {
287 /* NB: any ni ref held on stageq */
288 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
289 "%s: ff_check queued frame\n",
290 __func__);
291 return (0);
292 }
293 }
294 }
295 #endif /* IEEE80211_SUPPORT_SUPERG */
296
297 /*
298 * Grab the TX lock - serialise the TX process from this
299 * point (where TX state is being checked/modified)
300 * through to driver queue.
301 */
302 IEEE80211_TX_LOCK(ic);
303
304 /*
305 * XXX make the encap and transmit code a separate function
306 * so things like the FF (and later A-MSDU) path can just call
307 * it for flushed frames.
308 */
309 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) {
310 /*
311 * Encapsulate the packet in prep for transmission.
312 */
313 m = ieee80211_encap(vap, ni, m);
314 if (m == NULL) {
315 /* NB: stat+msg handled in ieee80211_encap */
316 IEEE80211_TX_UNLOCK(ic);
317 ieee80211_free_node(ni);
318 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
319 return (ENOBUFS);
320 }
321 }
322 (void) ieee80211_parent_xmitpkt(ic, m);
323
324 /*
325 * Unlock at this point - no need to hold it across
326 * ieee80211_free_node() (ie, the comlock)
327 */
328 IEEE80211_TX_UNLOCK(ic);
329 ic->ic_lastdata = ticks;
330
331 return (0);
332 }
333
334 /*
335 * Send the given mbuf through the given vap.
336 *
337 * This consumes the mbuf regardless of whether the transmit
338 * was successful or not.
339 *
340 * This does none of the initial checks that ieee80211_start()
341 * does (eg CAC timeout, interface wakeup) - the caller must
342 * do this first.
343 */
344 static int
ieee80211_start_pkt(struct ieee80211vap * vap,struct mbuf * m)345 ieee80211_start_pkt(struct ieee80211vap *vap, struct mbuf *m)
346 {
347 #define IS_DWDS(vap) \
348 (vap->iv_opmode == IEEE80211_M_WDS && \
349 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0)
350 struct ieee80211com *ic = vap->iv_ic;
351 struct ifnet *ifp = vap->iv_ifp;
352 struct ieee80211_node *ni;
353 struct ether_header *eh;
354
355 /*
356 * Cancel any background scan.
357 */
358 if (ic->ic_flags & IEEE80211_F_SCAN)
359 ieee80211_cancel_anyscan(vap);
360 /*
361 * Find the node for the destination so we can do
362 * things like power save and fast frames aggregation.
363 *
364 * NB: past this point various code assumes the first
365 * mbuf has the 802.3 header present (and contiguous).
366 */
367 ni = NULL;
368 if (m->m_len < sizeof(struct ether_header) &&
369 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) {
370 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
371 "discard frame, %s\n", "m_pullup failed");
372 vap->iv_stats.is_tx_nobuf++; /* XXX */
373 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
374 return (ENOBUFS);
375 }
376 eh = mtod(m, struct ether_header *);
377 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
378 if (IS_DWDS(vap)) {
379 /*
380 * Only unicast frames from the above go out
381 * DWDS vaps; multicast frames are handled by
382 * dispatching the frame as it comes through
383 * the AP vap (see below).
384 */
385 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS,
386 eh->ether_dhost, "mcast", "%s", "on DWDS");
387 vap->iv_stats.is_dwds_mcast++;
388 m_freem(m);
389 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
390 /* XXX better status? */
391 return (ENOBUFS);
392 }
393 if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
394 /*
395 * Spam DWDS vap's w/ multicast traffic.
396 */
397 /* XXX only if dwds in use? */
398 ieee80211_dwds_mcast(vap, m);
399 }
400 }
401 #ifdef IEEE80211_SUPPORT_MESH
402 if (vap->iv_opmode != IEEE80211_M_MBSS) {
403 #endif
404 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
405 if (ni == NULL) {
406 /* NB: ieee80211_find_txnode does stat+msg */
407 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
408 m_freem(m);
409 /* XXX better status? */
410 return (ENOBUFS);
411 }
412 if (ni->ni_associd == 0 &&
413 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) {
414 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT,
415 eh->ether_dhost, NULL,
416 "sta not associated (type 0x%04x)",
417 htons(eh->ether_type));
418 vap->iv_stats.is_tx_notassoc++;
419 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
420 m_freem(m);
421 ieee80211_free_node(ni);
422 /* XXX better status? */
423 return (ENOBUFS);
424 }
425 #ifdef IEEE80211_SUPPORT_MESH
426 } else {
427 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) {
428 /*
429 * Proxy station only if configured.
430 */
431 if (!ieee80211_mesh_isproxyena(vap)) {
432 IEEE80211_DISCARD_MAC(vap,
433 IEEE80211_MSG_OUTPUT |
434 IEEE80211_MSG_MESH,
435 eh->ether_dhost, NULL,
436 "%s", "proxy not enabled");
437 vap->iv_stats.is_mesh_notproxy++;
438 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
439 m_freem(m);
440 /* XXX better status? */
441 return (ENOBUFS);
442 }
443 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
444 "forward frame from DS SA(%6D), DA(%6D)\n",
445 eh->ether_shost, ":",
446 eh->ether_dhost, ":");
447 ieee80211_mesh_proxy_check(vap, eh->ether_shost);
448 }
449 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m);
450 if (ni == NULL) {
451 /*
452 * NB: ieee80211_mesh_discover holds/disposes
453 * frame (e.g. queueing on path discovery).
454 */
455 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
456 /* XXX better status? */
457 return (ENOBUFS);
458 }
459 }
460 #endif
461
462 /*
463 * We've resolved the sender, so attempt to transmit it.
464 */
465
466 if (vap->iv_state == IEEE80211_S_SLEEP) {
467 /*
468 * In power save; queue frame and then wakeup device
469 * for transmit.
470 */
471 ic->ic_lastdata = ticks;
472 if (ieee80211_pwrsave(ni, m) != 0)
473 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
474 ieee80211_free_node(ni);
475 ieee80211_new_state(vap, IEEE80211_S_RUN, 0);
476 return (0);
477 }
478
479 if (ieee80211_vap_pkt_send_dest(vap, m, ni) != 0)
480 return (ENOBUFS);
481 return (0);
482 #undef IS_DWDS
483 }
484
485 /*
486 * Start method for vap's. All packets from the stack come
487 * through here. We handle common processing of the packets
488 * before dispatching them to the underlying device.
489 *
490 * if_transmit() requires that the mbuf be consumed by this call
491 * regardless of the return condition.
492 */
493 int
ieee80211_vap_transmit(struct ifnet * ifp,struct mbuf * m)494 ieee80211_vap_transmit(struct ifnet *ifp, struct mbuf *m)
495 {
496 struct ieee80211vap *vap = ifp->if_softc;
497 struct ieee80211com *ic = vap->iv_ic;
498
499 /*
500 * No data frames go out unless we're running.
501 * Note in particular this covers CAC and CSA
502 * states (though maybe we should check muting
503 * for CSA).
504 */
505 if (vap->iv_state != IEEE80211_S_RUN &&
506 vap->iv_state != IEEE80211_S_SLEEP) {
507 IEEE80211_LOCK(ic);
508 /* re-check under the com lock to avoid races */
509 if (vap->iv_state != IEEE80211_S_RUN &&
510 vap->iv_state != IEEE80211_S_SLEEP) {
511 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
512 "%s: ignore queue, in %s state\n",
513 __func__, ieee80211_state_name[vap->iv_state]);
514 vap->iv_stats.is_tx_badstate++;
515 IEEE80211_UNLOCK(ic);
516 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
517 m_freem(m);
518 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
519 return (ENETDOWN);
520 }
521 IEEE80211_UNLOCK(ic);
522 }
523
524 /*
525 * Sanitize mbuf flags for net80211 use. We cannot
526 * clear M_PWR_SAV or M_MORE_DATA because these may
527 * be set for frames that are re-submitted from the
528 * power save queue.
529 *
530 * NB: This must be done before ieee80211_classify as
531 * it marks EAPOL in frames with M_EAPOL.
532 */
533 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA);
534
535 /*
536 * Bump to the packet transmission path.
537 * The mbuf will be consumed here.
538 */
539 return (ieee80211_start_pkt(vap, m));
540 }
541
542 void
ieee80211_vap_qflush(struct ifnet * ifp)543 ieee80211_vap_qflush(struct ifnet *ifp)
544 {
545
546 /* Empty for now */
547 }
548
549 /*
550 * 802.11 raw output routine.
551 *
552 * XXX TODO: this (and other send routines) should correctly
553 * XXX keep the pwr mgmt bit set if it decides to call into the
554 * XXX driver to send a frame whilst the state is SLEEP.
555 *
556 * Otherwise the peer may decide that we're awake and flood us
557 * with traffic we are still too asleep to receive!
558 */
559 int
ieee80211_raw_output(struct ieee80211vap * vap,struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_bpf_params * params)560 ieee80211_raw_output(struct ieee80211vap *vap, struct ieee80211_node *ni,
561 struct mbuf *m, const struct ieee80211_bpf_params *params)
562 {
563 struct ieee80211com *ic = vap->iv_ic;
564 int error;
565
566 /*
567 * Set node - the caller has taken a reference, so ensure
568 * that the mbuf has the same node value that
569 * it would if it were going via the normal path.
570 */
571 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
572 m->m_pkthdr.rcvif = (void *)ni;
573
574 /*
575 * Attempt to add bpf transmit parameters.
576 *
577 * For now it's ok to fail; the raw_xmit api still takes
578 * them as an option.
579 *
580 * Later on when ic_raw_xmit() has params removed,
581 * they'll have to be added - so fail the transmit if
582 * they can't be.
583 */
584 if (params)
585 (void) ieee80211_add_xmit_params(m, params);
586
587 error = ic->ic_raw_xmit(ni, m, params);
588 if (error) {
589 if_inc_counter(vap->iv_ifp, IFCOUNTER_OERRORS, 1);
590 ieee80211_free_node(ni);
591 }
592 return (error);
593 }
594
595 static int
ieee80211_validate_frame(struct mbuf * m,const struct ieee80211_bpf_params * params)596 ieee80211_validate_frame(struct mbuf *m,
597 const struct ieee80211_bpf_params *params)
598 {
599 struct ieee80211_frame *wh;
600 int type;
601
602 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack))
603 return (EINVAL);
604
605 wh = mtod(m, struct ieee80211_frame *);
606 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
607 IEEE80211_FC0_VERSION_0)
608 return (EINVAL);
609
610 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
611 if (type != IEEE80211_FC0_TYPE_DATA) {
612 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) !=
613 IEEE80211_FC1_DIR_NODS)
614 return (EINVAL);
615
616 if (type != IEEE80211_FC0_TYPE_MGT &&
617 (wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG) != 0)
618 return (EINVAL);
619
620 /* XXX skip other field checks? */
621 }
622
623 if ((params && (params->ibp_flags & IEEE80211_BPF_CRYPTO) != 0) ||
624 (IEEE80211_IS_PROTECTED(wh))) {
625 int subtype;
626
627 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
628
629 /*
630 * See IEEE Std 802.11-2012,
631 * 8.2.4.1.9 'Protected Frame field'
632 */
633 /* XXX no support for robust management frames yet. */
634 if (!(type == IEEE80211_FC0_TYPE_DATA ||
635 (type == IEEE80211_FC0_TYPE_MGT &&
636 subtype == IEEE80211_FC0_SUBTYPE_AUTH)))
637 return (EINVAL);
638
639 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED;
640 }
641
642 if (m->m_pkthdr.len < ieee80211_anyhdrsize(wh))
643 return (EINVAL);
644
645 return (0);
646 }
647
648 static int
ieee80211_validate_rate(struct ieee80211_node * ni,uint8_t rate)649 ieee80211_validate_rate(struct ieee80211_node *ni, uint8_t rate)
650 {
651 struct ieee80211com *ic = ni->ni_ic;
652
653 if (IEEE80211_IS_HT_RATE(rate)) {
654 if ((ic->ic_htcaps & IEEE80211_HTC_HT) == 0)
655 return (EINVAL);
656
657 rate = IEEE80211_RV(rate);
658 if (rate <= 31) {
659 if (rate > ic->ic_txstream * 8 - 1)
660 return (EINVAL);
661
662 return (0);
663 }
664
665 if (rate == 32) {
666 if ((ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0)
667 return (EINVAL);
668
669 return (0);
670 }
671
672 if ((ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) == 0)
673 return (EINVAL);
674
675 switch (ic->ic_txstream) {
676 case 0:
677 case 1:
678 return (EINVAL);
679 case 2:
680 if (rate > 38)
681 return (EINVAL);
682
683 return (0);
684 case 3:
685 if (rate > 52)
686 return (EINVAL);
687
688 return (0);
689 case 4:
690 default:
691 if (rate > 76)
692 return (EINVAL);
693
694 return (0);
695 }
696 }
697
698 if (!ieee80211_isratevalid(ic->ic_rt, rate))
699 return (EINVAL);
700
701 return (0);
702 }
703
704 static int
ieee80211_sanitize_rates(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_bpf_params * params)705 ieee80211_sanitize_rates(struct ieee80211_node *ni, struct mbuf *m,
706 const struct ieee80211_bpf_params *params)
707 {
708 int error;
709
710 if (!params)
711 return (0); /* nothing to do */
712
713 /* NB: most drivers assume that ibp_rate0 is set (!= 0). */
714 if (params->ibp_rate0 != 0) {
715 error = ieee80211_validate_rate(ni, params->ibp_rate0);
716 if (error != 0)
717 return (error);
718 } else {
719 /* XXX pre-setup some default (e.g., mgmt / mcast) rate */
720 /* XXX __DECONST? */
721 (void) m;
722 }
723
724 if (params->ibp_rate1 != 0 &&
725 (error = ieee80211_validate_rate(ni, params->ibp_rate1)) != 0)
726 return (error);
727
728 if (params->ibp_rate2 != 0 &&
729 (error = ieee80211_validate_rate(ni, params->ibp_rate2)) != 0)
730 return (error);
731
732 if (params->ibp_rate3 != 0 &&
733 (error = ieee80211_validate_rate(ni, params->ibp_rate3)) != 0)
734 return (error);
735
736 return (0);
737 }
738
739 /*
740 * 802.11 output routine. This is (currently) used only to
741 * connect bpf write calls to the 802.11 layer for injecting
742 * raw 802.11 frames.
743 */
744 int
ieee80211_output(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * dst,struct route * ro)745 ieee80211_output(struct ifnet *ifp, struct mbuf *m,
746 const struct sockaddr *dst, struct route *ro)
747 {
748 #define senderr(e) do { error = (e); goto bad;} while (0)
749 const struct ieee80211_bpf_params *params = NULL;
750 struct ieee80211_node *ni = NULL;
751 struct ieee80211vap *vap;
752 struct ieee80211_frame *wh;
753 struct ieee80211com *ic = NULL;
754 int error;
755 int ret;
756
757 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) {
758 /*
759 * Short-circuit requests if the vap is marked OACTIVE
760 * as this can happen because a packet came down through
761 * ieee80211_start before the vap entered RUN state in
762 * which case it's ok to just drop the frame. This
763 * should not be necessary but callers of if_output don't
764 * check OACTIVE.
765 */
766 senderr(ENETDOWN);
767 }
768 vap = ifp->if_softc;
769 ic = vap->iv_ic;
770 /*
771 * Hand to the 802.3 code if not tagged as
772 * a raw 802.11 frame.
773 */
774 if (dst->sa_family != AF_IEEE80211)
775 return vap->iv_output(ifp, m, dst, ro);
776 #ifdef MAC
777 error = mac_ifnet_check_transmit(ifp, m);
778 if (error)
779 senderr(error);
780 #endif
781 if (ifp->if_flags & IFF_MONITOR)
782 senderr(ENETDOWN);
783 if (!IFNET_IS_UP_RUNNING(ifp))
784 senderr(ENETDOWN);
785 if (vap->iv_state == IEEE80211_S_CAC) {
786 IEEE80211_DPRINTF(vap,
787 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
788 "block %s frame in CAC state\n", "raw data");
789 vap->iv_stats.is_tx_badstate++;
790 senderr(EIO); /* XXX */
791 } else if (vap->iv_state == IEEE80211_S_SCAN)
792 senderr(EIO);
793 /* XXX bypass bridge, pfil, carp, etc. */
794
795 /*
796 * NB: DLT_IEEE802_11_RADIO identifies the parameters are
797 * present by setting the sa_len field of the sockaddr (yes,
798 * this is a hack).
799 * NB: we assume sa_data is suitably aligned to cast.
800 */
801 if (dst->sa_len != 0)
802 params = (const struct ieee80211_bpf_params *)dst->sa_data;
803
804 error = ieee80211_validate_frame(m, params);
805 if (error != 0)
806 senderr(error);
807
808 wh = mtod(m, struct ieee80211_frame *);
809
810 /* locate destination node */
811 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
812 case IEEE80211_FC1_DIR_NODS:
813 case IEEE80211_FC1_DIR_FROMDS:
814 ni = ieee80211_find_txnode(vap, wh->i_addr1);
815 break;
816 case IEEE80211_FC1_DIR_TODS:
817 case IEEE80211_FC1_DIR_DSTODS:
818 ni = ieee80211_find_txnode(vap, wh->i_addr3);
819 break;
820 default:
821 senderr(EDOOFUS);
822 }
823 if (ni == NULL) {
824 /*
825 * Permit packets w/ bpf params through regardless
826 * (see below about sa_len).
827 */
828 if (dst->sa_len == 0)
829 senderr(EHOSTUNREACH);
830 ni = ieee80211_ref_node(vap->iv_bss);
831 }
832
833 /*
834 * Sanitize mbuf for net80211 flags leaked from above.
835 *
836 * NB: This must be done before ieee80211_classify as
837 * it marks EAPOL in frames with M_EAPOL.
838 */
839 m->m_flags &= ~M_80211_TX;
840 m->m_flags |= M_ENCAP; /* mark encapsulated */
841
842 if (IEEE80211_IS_DATA(wh)) {
843 /* calculate priority so drivers can find the tx queue */
844 if (ieee80211_classify(ni, m))
845 senderr(EIO); /* XXX */
846
847 /* NB: ieee80211_encap does not include 802.11 header */
848 IEEE80211_NODE_STAT_ADD(ni, tx_bytes,
849 m->m_pkthdr.len - ieee80211_hdrsize(wh));
850 } else
851 M_WME_SETAC(m, WME_AC_BE);
852
853 error = ieee80211_sanitize_rates(ni, m, params);
854 if (error != 0)
855 senderr(error);
856
857 IEEE80211_NODE_STAT(ni, tx_data);
858 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
859 IEEE80211_NODE_STAT(ni, tx_mcast);
860 m->m_flags |= M_MCAST;
861 } else
862 IEEE80211_NODE_STAT(ni, tx_ucast);
863
864 IEEE80211_TX_LOCK(ic);
865 ret = ieee80211_raw_output(vap, ni, m, params);
866 IEEE80211_TX_UNLOCK(ic);
867 return (ret);
868 bad:
869 if (m != NULL)
870 m_freem(m);
871 if (ni != NULL)
872 ieee80211_free_node(ni);
873 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
874 return error;
875 #undef senderr
876 }
877
878 /*
879 * Set the direction field and address fields of an outgoing
880 * frame. Note this should be called early on in constructing
881 * a frame as it sets i_fc[1]; other bits can then be or'd in.
882 */
883 void
ieee80211_send_setup(struct ieee80211_node * ni,struct mbuf * m,int type,int tid,const uint8_t sa[IEEE80211_ADDR_LEN],const uint8_t da[IEEE80211_ADDR_LEN],const uint8_t bssid[IEEE80211_ADDR_LEN])884 ieee80211_send_setup(
885 struct ieee80211_node *ni,
886 struct mbuf *m,
887 int type, int tid,
888 const uint8_t sa[IEEE80211_ADDR_LEN],
889 const uint8_t da[IEEE80211_ADDR_LEN],
890 const uint8_t bssid[IEEE80211_ADDR_LEN])
891 {
892 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh)
893 struct ieee80211vap *vap = ni->ni_vap;
894 struct ieee80211_tx_ampdu *tap;
895 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
896 ieee80211_seq seqno;
897
898 IEEE80211_TX_LOCK_ASSERT(ni->ni_ic);
899
900 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type;
901 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) {
902 switch (vap->iv_opmode) {
903 case IEEE80211_M_STA:
904 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
905 IEEE80211_ADDR_COPY(wh->i_addr1, bssid);
906 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
907 IEEE80211_ADDR_COPY(wh->i_addr3, da);
908 break;
909 case IEEE80211_M_IBSS:
910 case IEEE80211_M_AHDEMO:
911 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
912 IEEE80211_ADDR_COPY(wh->i_addr1, da);
913 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
914 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
915 break;
916 case IEEE80211_M_HOSTAP:
917 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
918 IEEE80211_ADDR_COPY(wh->i_addr1, da);
919 IEEE80211_ADDR_COPY(wh->i_addr2, bssid);
920 IEEE80211_ADDR_COPY(wh->i_addr3, sa);
921 break;
922 case IEEE80211_M_WDS:
923 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
924 IEEE80211_ADDR_COPY(wh->i_addr1, da);
925 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
926 IEEE80211_ADDR_COPY(wh->i_addr3, da);
927 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
928 break;
929 case IEEE80211_M_MBSS:
930 #ifdef IEEE80211_SUPPORT_MESH
931 if (IEEE80211_IS_MULTICAST(da)) {
932 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
933 /* XXX next hop */
934 IEEE80211_ADDR_COPY(wh->i_addr1, da);
935 IEEE80211_ADDR_COPY(wh->i_addr2,
936 vap->iv_myaddr);
937 } else {
938 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
939 IEEE80211_ADDR_COPY(wh->i_addr1, da);
940 IEEE80211_ADDR_COPY(wh->i_addr2,
941 vap->iv_myaddr);
942 IEEE80211_ADDR_COPY(wh->i_addr3, da);
943 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
944 }
945 #endif
946 break;
947 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */
948 break;
949 }
950 } else {
951 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
952 IEEE80211_ADDR_COPY(wh->i_addr1, da);
953 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
954 #ifdef IEEE80211_SUPPORT_MESH
955 if (vap->iv_opmode == IEEE80211_M_MBSS)
956 IEEE80211_ADDR_COPY(wh->i_addr3, sa);
957 else
958 #endif
959 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
960 }
961 *(uint16_t *)&wh->i_dur[0] = 0;
962
963 /*
964 * XXX TODO: this is what the TX lock is for.
965 * Here we're incrementing sequence numbers, and they
966 * need to be in lock-step with what the driver is doing
967 * both in TX ordering and crypto encap (IV increment.)
968 *
969 * If the driver does seqno itself, then we can skip
970 * assigning sequence numbers here, and we can avoid
971 * requiring the TX lock.
972 */
973 tap = &ni->ni_tx_ampdu[tid];
974 if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap)) {
975 m->m_flags |= M_AMPDU_MPDU;
976
977 /* NB: zero out i_seq field (for s/w encryption etc) */
978 *(uint16_t *)&wh->i_seq[0] = 0;
979 } else {
980 if (IEEE80211_HAS_SEQ(type & IEEE80211_FC0_TYPE_MASK,
981 type & IEEE80211_FC0_SUBTYPE_MASK))
982 /*
983 * 802.11-2012 9.3.2.10 - QoS multicast frames
984 * come out of a different seqno space.
985 */
986 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
987 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
988 } else {
989 seqno = ni->ni_txseqs[tid]++;
990 }
991 else
992 seqno = 0;
993
994 *(uint16_t *)&wh->i_seq[0] =
995 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
996 M_SEQNO_SET(m, seqno);
997 }
998
999 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
1000 m->m_flags |= M_MCAST;
1001 #undef WH4
1002 }
1003
1004 /*
1005 * Send a management frame to the specified node. The node pointer
1006 * must have a reference as the pointer will be passed to the driver
1007 * and potentially held for a long time. If the frame is successfully
1008 * dispatched to the driver, then it is responsible for freeing the
1009 * reference (and potentially free'ing up any associated storage);
1010 * otherwise deal with reclaiming any reference (on error).
1011 */
1012 int
ieee80211_mgmt_output(struct ieee80211_node * ni,struct mbuf * m,int type,struct ieee80211_bpf_params * params)1013 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type,
1014 struct ieee80211_bpf_params *params)
1015 {
1016 struct ieee80211vap *vap = ni->ni_vap;
1017 struct ieee80211com *ic = ni->ni_ic;
1018 struct ieee80211_frame *wh;
1019 int ret;
1020
1021 KASSERT(ni != NULL, ("null node"));
1022
1023 if (vap->iv_state == IEEE80211_S_CAC) {
1024 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
1025 ni, "block %s frame in CAC state",
1026 ieee80211_mgt_subtype_name(type));
1027 vap->iv_stats.is_tx_badstate++;
1028 ieee80211_free_node(ni);
1029 m_freem(m);
1030 return EIO; /* XXX */
1031 }
1032
1033 M_PREPEND(m, sizeof(struct ieee80211_frame), IEEE80211_M_NOWAIT);
1034 if (m == NULL) {
1035 ieee80211_free_node(ni);
1036 return ENOMEM;
1037 }
1038
1039 IEEE80211_TX_LOCK(ic);
1040
1041 wh = mtod(m, struct ieee80211_frame *);
1042 ieee80211_send_setup(ni, m,
1043 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID,
1044 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
1045 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) {
1046 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1,
1047 "encrypting frame (%s)", __func__);
1048 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED;
1049 }
1050 m->m_flags |= M_ENCAP; /* mark encapsulated */
1051
1052 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?"));
1053 M_WME_SETAC(m, params->ibp_pri);
1054
1055 #ifdef IEEE80211_DEBUG
1056 /* avoid printing too many frames */
1057 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) ||
1058 ieee80211_msg_dumppkts(vap)) {
1059 ieee80211_note(vap, "[%s] send %s on channel %u\n",
1060 ether_sprintf(wh->i_addr1),
1061 ieee80211_mgt_subtype_name(type),
1062 ieee80211_chan2ieee(ic, ic->ic_curchan));
1063 }
1064 #endif
1065 IEEE80211_NODE_STAT(ni, tx_mgmt);
1066
1067 ret = ieee80211_raw_output(vap, ni, m, params);
1068 IEEE80211_TX_UNLOCK(ic);
1069 return (ret);
1070 }
1071
1072 static void
ieee80211_nulldata_transmitted(struct ieee80211_node * ni,void * arg,int status)1073 ieee80211_nulldata_transmitted(struct ieee80211_node *ni, void *arg,
1074 int status)
1075 {
1076 struct ieee80211vap *vap = ni->ni_vap;
1077
1078 wakeup(vap);
1079 }
1080
1081 /*
1082 * Send a null data frame to the specified node. If the station
1083 * is setup for QoS then a QoS Null Data frame is constructed.
1084 * If this is a WDS station then a 4-address frame is constructed.
1085 *
1086 * NB: the caller is assumed to have setup a node reference
1087 * for use; this is necessary to deal with a race condition
1088 * when probing for inactive stations. Like ieee80211_mgmt_output
1089 * we must cleanup any node reference on error; however we
1090 * can safely just unref it as we know it will never be the
1091 * last reference to the node.
1092 */
1093 int
ieee80211_send_nulldata(struct ieee80211_node * ni)1094 ieee80211_send_nulldata(struct ieee80211_node *ni)
1095 {
1096 struct ieee80211vap *vap = ni->ni_vap;
1097 struct ieee80211com *ic = ni->ni_ic;
1098 struct mbuf *m;
1099 struct ieee80211_frame *wh;
1100 int hdrlen;
1101 uint8_t *frm;
1102 int ret;
1103
1104 if (vap->iv_state == IEEE80211_S_CAC) {
1105 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
1106 ni, "block %s frame in CAC state", "null data");
1107 ieee80211_node_decref(ni);
1108 vap->iv_stats.is_tx_badstate++;
1109 return EIO; /* XXX */
1110 }
1111
1112 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT))
1113 hdrlen = sizeof(struct ieee80211_qosframe);
1114 else
1115 hdrlen = sizeof(struct ieee80211_frame);
1116 /* NB: only WDS vap's get 4-address frames */
1117 if (vap->iv_opmode == IEEE80211_M_WDS)
1118 hdrlen += IEEE80211_ADDR_LEN;
1119 if (ic->ic_flags & IEEE80211_F_DATAPAD)
1120 hdrlen = roundup(hdrlen, sizeof(uint32_t));
1121
1122 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0);
1123 if (m == NULL) {
1124 /* XXX debug msg */
1125 ieee80211_node_decref(ni);
1126 vap->iv_stats.is_tx_nobuf++;
1127 return ENOMEM;
1128 }
1129 KASSERT(M_LEADINGSPACE(m) >= hdrlen,
1130 ("leading space %zd", M_LEADINGSPACE(m)));
1131 M_PREPEND(m, hdrlen, IEEE80211_M_NOWAIT);
1132 if (m == NULL) {
1133 /* NB: cannot happen */
1134 ieee80211_free_node(ni);
1135 return ENOMEM;
1136 }
1137
1138 IEEE80211_TX_LOCK(ic);
1139
1140 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */
1141 if (ni->ni_flags & IEEE80211_NODE_QOS) {
1142 const int tid = WME_AC_TO_TID(WME_AC_BE);
1143 uint8_t *qos;
1144
1145 ieee80211_send_setup(ni, m,
1146 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL,
1147 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
1148
1149 if (vap->iv_opmode == IEEE80211_M_WDS)
1150 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
1151 else
1152 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
1153 qos[0] = tid & IEEE80211_QOS_TID;
1154 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy)
1155 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
1156 qos[1] = 0;
1157 } else {
1158 ieee80211_send_setup(ni, m,
1159 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA,
1160 IEEE80211_NONQOS_TID,
1161 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
1162 }
1163 if (vap->iv_opmode != IEEE80211_M_WDS) {
1164 /* NB: power management bit is never sent by an AP */
1165 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
1166 vap->iv_opmode != IEEE80211_M_HOSTAP)
1167 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT;
1168 }
1169 if ((ic->ic_flags & IEEE80211_F_SCAN) &&
1170 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)) {
1171 ieee80211_add_callback(m, ieee80211_nulldata_transmitted,
1172 NULL);
1173 }
1174 m->m_len = m->m_pkthdr.len = hdrlen;
1175 m->m_flags |= M_ENCAP; /* mark encapsulated */
1176
1177 M_WME_SETAC(m, WME_AC_BE);
1178
1179 IEEE80211_NODE_STAT(ni, tx_data);
1180
1181 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni,
1182 "send %snull data frame on channel %u, pwr mgt %s",
1183 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "",
1184 ieee80211_chan2ieee(ic, ic->ic_curchan),
1185 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis");
1186
1187 ret = ieee80211_raw_output(vap, ni, m, NULL);
1188 IEEE80211_TX_UNLOCK(ic);
1189 return (ret);
1190 }
1191
1192 /*
1193 * Assign priority to a frame based on any vlan tag assigned
1194 * to the station and/or any Diffserv setting in an IP header.
1195 * Finally, if an ACM policy is setup (in station mode) it's
1196 * applied.
1197 */
1198 int
ieee80211_classify(struct ieee80211_node * ni,struct mbuf * m)1199 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m)
1200 {
1201 const struct ether_header *eh = NULL;
1202 uint16_t ether_type;
1203 int v_wme_ac, d_wme_ac, ac;
1204
1205 if (__predict_false(m->m_flags & M_ENCAP)) {
1206 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
1207 struct llc *llc;
1208 int hdrlen, subtype;
1209
1210 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1211 if (subtype & IEEE80211_FC0_SUBTYPE_NODATA) {
1212 ac = WME_AC_BE;
1213 goto done;
1214 }
1215
1216 hdrlen = ieee80211_hdrsize(wh);
1217 if (m->m_pkthdr.len < hdrlen + sizeof(*llc))
1218 return 1;
1219
1220 llc = (struct llc *)mtodo(m, hdrlen);
1221 if (llc->llc_dsap != LLC_SNAP_LSAP ||
1222 llc->llc_ssap != LLC_SNAP_LSAP ||
1223 llc->llc_control != LLC_UI ||
1224 llc->llc_snap.org_code[0] != 0 ||
1225 llc->llc_snap.org_code[1] != 0 ||
1226 llc->llc_snap.org_code[2] != 0)
1227 return 1;
1228
1229 ether_type = llc->llc_snap.ether_type;
1230 } else {
1231 eh = mtod(m, struct ether_header *);
1232 ether_type = eh->ether_type;
1233 }
1234
1235 /*
1236 * Always promote PAE/EAPOL frames to high priority.
1237 */
1238 if (ether_type == htons(ETHERTYPE_PAE)) {
1239 /* NB: mark so others don't need to check header */
1240 m->m_flags |= M_EAPOL;
1241 ac = WME_AC_VO;
1242 goto done;
1243 }
1244 /*
1245 * Non-qos traffic goes to BE.
1246 */
1247 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) {
1248 ac = WME_AC_BE;
1249 goto done;
1250 }
1251
1252 /*
1253 * If node has a vlan tag then all traffic
1254 * to it must have a matching tag.
1255 */
1256 v_wme_ac = 0;
1257 if (ni->ni_vlan != 0) {
1258 if ((m->m_flags & M_VLANTAG) == 0) {
1259 IEEE80211_NODE_STAT(ni, tx_novlantag);
1260 return 1;
1261 }
1262 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) !=
1263 EVL_VLANOFTAG(ni->ni_vlan)) {
1264 IEEE80211_NODE_STAT(ni, tx_vlanmismatch);
1265 return 1;
1266 }
1267 /* map vlan priority to AC */
1268 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan));
1269 }
1270
1271 if (eh == NULL)
1272 goto no_eh;
1273
1274 /* XXX m_copydata may be too slow for fast path */
1275 switch (ntohs(eh->ether_type)) {
1276 #ifdef INET
1277 case ETHERTYPE_IP:
1278 {
1279 uint8_t tos;
1280 /*
1281 * IP frame, map the DSCP bits from the TOS field.
1282 */
1283 /* NB: ip header may not be in first mbuf */
1284 m_copydata(m, sizeof(struct ether_header) +
1285 offsetof(struct ip, ip_tos), sizeof(tos), &tos);
1286 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */
1287 d_wme_ac = TID_TO_WME_AC(tos);
1288 break;
1289 }
1290 #endif
1291 #ifdef INET6
1292 case ETHERTYPE_IPV6:
1293 {
1294 uint32_t flow;
1295 uint8_t tos;
1296 /*
1297 * IPv6 frame, map the DSCP bits from the traffic class field.
1298 */
1299 m_copydata(m, sizeof(struct ether_header) +
1300 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow),
1301 (caddr_t) &flow);
1302 tos = (uint8_t)(ntohl(flow) >> 20);
1303 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */
1304 d_wme_ac = TID_TO_WME_AC(tos);
1305 break;
1306 }
1307 #endif
1308 default:
1309 no_eh:
1310 d_wme_ac = WME_AC_BE;
1311 break;
1312 }
1313
1314 /*
1315 * Use highest priority AC.
1316 */
1317 if (v_wme_ac > d_wme_ac)
1318 ac = v_wme_ac;
1319 else
1320 ac = d_wme_ac;
1321
1322 /*
1323 * Apply ACM policy.
1324 */
1325 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) {
1326 static const int acmap[4] = {
1327 WME_AC_BK, /* WME_AC_BE */
1328 WME_AC_BK, /* WME_AC_BK */
1329 WME_AC_BE, /* WME_AC_VI */
1330 WME_AC_VI, /* WME_AC_VO */
1331 };
1332 struct ieee80211com *ic = ni->ni_ic;
1333
1334 while (ac != WME_AC_BK &&
1335 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm)
1336 ac = acmap[ac];
1337 }
1338 done:
1339 M_WME_SETAC(m, ac);
1340 return 0;
1341 }
1342
1343 /*
1344 * Insure there is sufficient contiguous space to encapsulate the
1345 * 802.11 data frame. If room isn't already there, arrange for it.
1346 * Drivers and cipher modules assume we have done the necessary work
1347 * and fail rudely if they don't find the space they need.
1348 */
1349 struct mbuf *
ieee80211_mbuf_adjust(struct ieee80211vap * vap,int hdrsize,struct ieee80211_key * key,struct mbuf * m)1350 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize,
1351 struct ieee80211_key *key, struct mbuf *m)
1352 {
1353 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc))
1354 int needed_space = vap->iv_ic->ic_headroom + hdrsize;
1355
1356 if (key != NULL) {
1357 /* XXX belongs in crypto code? */
1358 needed_space += key->wk_cipher->ic_header;
1359 /* XXX frags */
1360 /*
1361 * When crypto is being done in the host we must insure
1362 * the data are writable for the cipher routines; clone
1363 * a writable mbuf chain.
1364 * XXX handle SWMIC specially
1365 */
1366 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) {
1367 m = m_unshare(m, IEEE80211_M_NOWAIT);
1368 if (m == NULL) {
1369 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
1370 "%s: cannot get writable mbuf\n", __func__);
1371 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */
1372 return NULL;
1373 }
1374 }
1375 }
1376 /*
1377 * We know we are called just before stripping an Ethernet
1378 * header and prepending an LLC header. This means we know
1379 * there will be
1380 * sizeof(struct ether_header) - sizeof(struct llc)
1381 * bytes recovered to which we need additional space for the
1382 * 802.11 header and any crypto header.
1383 */
1384 /* XXX check trailing space and copy instead? */
1385 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) {
1386 struct mbuf *n = m_gethdr(IEEE80211_M_NOWAIT, m->m_type);
1387 if (n == NULL) {
1388 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
1389 "%s: cannot expand storage\n", __func__);
1390 vap->iv_stats.is_tx_nobuf++;
1391 m_freem(m);
1392 return NULL;
1393 }
1394 KASSERT(needed_space <= MHLEN,
1395 ("not enough room, need %u got %d\n", needed_space, MHLEN));
1396 /*
1397 * Setup new mbuf to have leading space to prepend the
1398 * 802.11 header and any crypto header bits that are
1399 * required (the latter are added when the driver calls
1400 * back to ieee80211_crypto_encap to do crypto encapsulation).
1401 */
1402 /* NB: must be first 'cuz it clobbers m_data */
1403 m_move_pkthdr(n, m);
1404 n->m_len = 0; /* NB: m_gethdr does not set */
1405 n->m_data += needed_space;
1406 /*
1407 * Pull up Ethernet header to create the expected layout.
1408 * We could use m_pullup but that's overkill (i.e. we don't
1409 * need the actual data) and it cannot fail so do it inline
1410 * for speed.
1411 */
1412 /* NB: struct ether_header is known to be contiguous */
1413 n->m_len += sizeof(struct ether_header);
1414 m->m_len -= sizeof(struct ether_header);
1415 m->m_data += sizeof(struct ether_header);
1416 /*
1417 * Replace the head of the chain.
1418 */
1419 n->m_next = m;
1420 m = n;
1421 }
1422 return m;
1423 #undef TO_BE_RECLAIMED
1424 }
1425
1426 /*
1427 * Return the transmit key to use in sending a unicast frame.
1428 * If a unicast key is set we use that. When no unicast key is set
1429 * we fall back to the default transmit key.
1430 */
1431 static __inline struct ieee80211_key *
ieee80211_crypto_getucastkey(struct ieee80211vap * vap,struct ieee80211_node * ni)1432 ieee80211_crypto_getucastkey(struct ieee80211vap *vap,
1433 struct ieee80211_node *ni)
1434 {
1435 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) {
1436 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
1437 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
1438 return NULL;
1439 return &vap->iv_nw_keys[vap->iv_def_txkey];
1440 } else {
1441 return &ni->ni_ucastkey;
1442 }
1443 }
1444
1445 /*
1446 * Return the transmit key to use in sending a multicast frame.
1447 * Multicast traffic always uses the group key which is installed as
1448 * the default tx key.
1449 */
1450 static __inline struct ieee80211_key *
ieee80211_crypto_getmcastkey(struct ieee80211vap * vap,struct ieee80211_node * ni)1451 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap,
1452 struct ieee80211_node *ni)
1453 {
1454 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
1455 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
1456 return NULL;
1457 return &vap->iv_nw_keys[vap->iv_def_txkey];
1458 }
1459
1460 /*
1461 * Encapsulate an outbound data frame. The mbuf chain is updated.
1462 * If an error is encountered NULL is returned. The caller is required
1463 * to provide a node reference and pullup the ethernet header in the
1464 * first mbuf.
1465 *
1466 * NB: Packet is assumed to be processed by ieee80211_classify which
1467 * marked EAPOL frames w/ M_EAPOL.
1468 */
1469 struct mbuf *
ieee80211_encap(struct ieee80211vap * vap,struct ieee80211_node * ni,struct mbuf * m)1470 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni,
1471 struct mbuf *m)
1472 {
1473 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh))
1474 #define MC01(mc) ((struct ieee80211_meshcntl_ae01 *)mc)
1475 struct ieee80211com *ic = ni->ni_ic;
1476 #ifdef IEEE80211_SUPPORT_MESH
1477 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1478 struct ieee80211_meshcntl_ae10 *mc;
1479 struct ieee80211_mesh_route *rt = NULL;
1480 int dir = -1;
1481 #endif
1482 struct ether_header eh;
1483 struct ieee80211_frame *wh;
1484 struct ieee80211_key *key;
1485 struct llc *llc;
1486 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr, is_mcast;
1487 ieee80211_seq seqno;
1488 int meshhdrsize, meshae;
1489 uint8_t *qos;
1490 int is_amsdu = 0;
1491
1492 IEEE80211_TX_LOCK_ASSERT(ic);
1493
1494 is_mcast = !! (m->m_flags & (M_MCAST | M_BCAST));
1495
1496 /*
1497 * Copy existing Ethernet header to a safe place. The
1498 * rest of the code assumes it's ok to strip it when
1499 * reorganizing state for the final encapsulation.
1500 */
1501 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!"));
1502 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t));
1503
1504 /*
1505 * Insure space for additional headers. First identify
1506 * transmit key to use in calculating any buffer adjustments
1507 * required. This is also used below to do privacy
1508 * encapsulation work. Then calculate the 802.11 header
1509 * size and any padding required by the driver.
1510 *
1511 * Note key may be NULL if we fall back to the default
1512 * transmit key and that is not set. In that case the
1513 * buffer may not be expanded as needed by the cipher
1514 * routines, but they will/should discard it.
1515 */
1516 if (vap->iv_flags & IEEE80211_F_PRIVACY) {
1517 if (vap->iv_opmode == IEEE80211_M_STA ||
1518 !IEEE80211_IS_MULTICAST(eh.ether_dhost) ||
1519 (vap->iv_opmode == IEEE80211_M_WDS &&
1520 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) {
1521 key = ieee80211_crypto_getucastkey(vap, ni);
1522 } else if ((vap->iv_opmode == IEEE80211_M_WDS) &&
1523 (! (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) {
1524 /*
1525 * Use ucastkey for DWDS transmit nodes, multicast
1526 * or otherwise.
1527 *
1528 * This is required to ensure that multicast frames
1529 * from a DWDS AP to a DWDS STA is encrypted with
1530 * a key that can actually work.
1531 *
1532 * There's no default key for multicast traffic
1533 * on a DWDS WDS VAP node (note NOT the DWDS enabled
1534 * AP VAP, the dynamically created per-STA WDS node)
1535 * so encap fails and transmit fails.
1536 */
1537 key = ieee80211_crypto_getucastkey(vap, ni);
1538 } else {
1539 key = ieee80211_crypto_getmcastkey(vap, ni);
1540 }
1541 if (key == NULL && (m->m_flags & M_EAPOL) == 0) {
1542 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
1543 eh.ether_dhost,
1544 "no default transmit key (%s) deftxkey %u",
1545 __func__, vap->iv_def_txkey);
1546 vap->iv_stats.is_tx_nodefkey++;
1547 goto bad;
1548 }
1549 } else
1550 key = NULL;
1551 /*
1552 * XXX Some ap's don't handle QoS-encapsulated EAPOL
1553 * frames so suppress use. This may be an issue if other
1554 * ap's require all data frames to be QoS-encapsulated
1555 * once negotiated in which case we'll need to make this
1556 * configurable.
1557 *
1558 * Don't send multicast QoS frames.
1559 * Technically multicast frames can be QoS if all stations in the
1560 * BSS are also QoS.
1561 *
1562 * NB: mesh data frames are QoS, including multicast frames.
1563 */
1564 addqos =
1565 (((is_mcast == 0) && (ni->ni_flags &
1566 (IEEE80211_NODE_QOS|IEEE80211_NODE_HT))) ||
1567 (vap->iv_opmode == IEEE80211_M_MBSS)) &&
1568 (m->m_flags & M_EAPOL) == 0;
1569
1570 if (addqos)
1571 hdrsize = sizeof(struct ieee80211_qosframe);
1572 else
1573 hdrsize = sizeof(struct ieee80211_frame);
1574 #ifdef IEEE80211_SUPPORT_MESH
1575 if (vap->iv_opmode == IEEE80211_M_MBSS) {
1576 /*
1577 * Mesh data frames are encapsulated according to the
1578 * rules of Section 11B.8.5 (p.139 of D3.0 spec).
1579 * o Group Addressed data (aka multicast) originating
1580 * at the local sta are sent w/ 3-address format and
1581 * address extension mode 00
1582 * o Individually Addressed data (aka unicast) originating
1583 * at the local sta are sent w/ 4-address format and
1584 * address extension mode 00
1585 * o Group Addressed data forwarded from a non-mesh sta are
1586 * sent w/ 3-address format and address extension mode 01
1587 * o Individually Address data from another sta are sent
1588 * w/ 4-address format and address extension mode 10
1589 */
1590 is4addr = 0; /* NB: don't use, disable */
1591 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) {
1592 rt = ieee80211_mesh_rt_find(vap, eh.ether_dhost);
1593 KASSERT(rt != NULL, ("route is NULL"));
1594 dir = IEEE80211_FC1_DIR_DSTODS;
1595 hdrsize += IEEE80211_ADDR_LEN;
1596 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
1597 if (IEEE80211_ADDR_EQ(rt->rt_mesh_gate,
1598 vap->iv_myaddr)) {
1599 IEEE80211_NOTE_MAC(vap,
1600 IEEE80211_MSG_MESH,
1601 eh.ether_dhost,
1602 "%s", "trying to send to ourself");
1603 goto bad;
1604 }
1605 meshae = IEEE80211_MESH_AE_10;
1606 meshhdrsize =
1607 sizeof(struct ieee80211_meshcntl_ae10);
1608 } else {
1609 meshae = IEEE80211_MESH_AE_00;
1610 meshhdrsize =
1611 sizeof(struct ieee80211_meshcntl);
1612 }
1613 } else {
1614 dir = IEEE80211_FC1_DIR_FROMDS;
1615 if (!IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) {
1616 /* proxy group */
1617 meshae = IEEE80211_MESH_AE_01;
1618 meshhdrsize =
1619 sizeof(struct ieee80211_meshcntl_ae01);
1620 } else {
1621 /* group */
1622 meshae = IEEE80211_MESH_AE_00;
1623 meshhdrsize = sizeof(struct ieee80211_meshcntl);
1624 }
1625 }
1626 } else {
1627 #endif
1628 /*
1629 * 4-address frames need to be generated for:
1630 * o packets sent through a WDS vap (IEEE80211_M_WDS)
1631 * o packets sent through a vap marked for relaying
1632 * (e.g. a station operating with dynamic WDS)
1633 */
1634 is4addr = vap->iv_opmode == IEEE80211_M_WDS ||
1635 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) &&
1636 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr));
1637 if (is4addr)
1638 hdrsize += IEEE80211_ADDR_LEN;
1639 meshhdrsize = meshae = 0;
1640 #ifdef IEEE80211_SUPPORT_MESH
1641 }
1642 #endif
1643 /*
1644 * Honor driver DATAPAD requirement.
1645 */
1646 if (ic->ic_flags & IEEE80211_F_DATAPAD)
1647 hdrspace = roundup(hdrsize, sizeof(uint32_t));
1648 else
1649 hdrspace = hdrsize;
1650
1651 if (__predict_true((m->m_flags & M_FF) == 0)) {
1652 /*
1653 * Normal frame.
1654 */
1655 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m);
1656 if (m == NULL) {
1657 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
1658 goto bad;
1659 }
1660 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */
1661 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
1662 llc = mtod(m, struct llc *);
1663 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
1664 llc->llc_control = LLC_UI;
1665 llc->llc_snap.org_code[0] = 0;
1666 llc->llc_snap.org_code[1] = 0;
1667 llc->llc_snap.org_code[2] = 0;
1668 llc->llc_snap.ether_type = eh.ether_type;
1669 } else {
1670 #ifdef IEEE80211_SUPPORT_SUPERG
1671 /*
1672 * Aggregated frame. Check if it's for AMSDU or FF.
1673 *
1674 * XXX TODO: IEEE80211_NODE_AMSDU* isn't implemented
1675 * anywhere for some reason. But, since 11n requires
1676 * AMSDU RX, we can just assume "11n" == "AMSDU".
1677 */
1678 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, "%s: called; M_FF\n", __func__);
1679 if (ieee80211_amsdu_tx_ok(ni)) {
1680 m = ieee80211_amsdu_encap(vap, m, hdrspace + meshhdrsize, key);
1681 is_amsdu = 1;
1682 } else {
1683 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key);
1684 }
1685 if (m == NULL)
1686 #endif
1687 goto bad;
1688 }
1689 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */
1690
1691 M_PREPEND(m, hdrspace + meshhdrsize, IEEE80211_M_NOWAIT);
1692 if (m == NULL) {
1693 vap->iv_stats.is_tx_nobuf++;
1694 goto bad;
1695 }
1696 wh = mtod(m, struct ieee80211_frame *);
1697 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA;
1698 *(uint16_t *)wh->i_dur = 0;
1699 qos = NULL; /* NB: quiet compiler */
1700 if (is4addr) {
1701 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
1702 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
1703 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1704 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1705 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost);
1706 } else switch (vap->iv_opmode) {
1707 case IEEE80211_M_STA:
1708 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
1709 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid);
1710 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
1711 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1712 break;
1713 case IEEE80211_M_IBSS:
1714 case IEEE80211_M_AHDEMO:
1715 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
1716 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1717 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
1718 /*
1719 * NB: always use the bssid from iv_bss as the
1720 * neighbor's may be stale after an ibss merge
1721 */
1722 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid);
1723 break;
1724 case IEEE80211_M_HOSTAP:
1725 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
1726 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1727 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid);
1728 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
1729 break;
1730 #ifdef IEEE80211_SUPPORT_MESH
1731 case IEEE80211_M_MBSS:
1732 /* NB: offset by hdrspace to deal with DATAPAD */
1733 mc = (struct ieee80211_meshcntl_ae10 *)
1734 (mtod(m, uint8_t *) + hdrspace);
1735 wh->i_fc[1] = dir;
1736 switch (meshae) {
1737 case IEEE80211_MESH_AE_00: /* no proxy */
1738 mc->mc_flags = 0;
1739 if (dir == IEEE80211_FC1_DIR_DSTODS) { /* ucast */
1740 IEEE80211_ADDR_COPY(wh->i_addr1,
1741 ni->ni_macaddr);
1742 IEEE80211_ADDR_COPY(wh->i_addr2,
1743 vap->iv_myaddr);
1744 IEEE80211_ADDR_COPY(wh->i_addr3,
1745 eh.ether_dhost);
1746 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4,
1747 eh.ether_shost);
1748 qos =((struct ieee80211_qosframe_addr4 *)
1749 wh)->i_qos;
1750 } else if (dir == IEEE80211_FC1_DIR_FROMDS) {
1751 /* mcast */
1752 IEEE80211_ADDR_COPY(wh->i_addr1,
1753 eh.ether_dhost);
1754 IEEE80211_ADDR_COPY(wh->i_addr2,
1755 vap->iv_myaddr);
1756 IEEE80211_ADDR_COPY(wh->i_addr3,
1757 eh.ether_shost);
1758 qos = ((struct ieee80211_qosframe *)
1759 wh)->i_qos;
1760 }
1761 break;
1762 case IEEE80211_MESH_AE_01: /* mcast, proxy */
1763 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
1764 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1765 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1766 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr);
1767 mc->mc_flags = 1;
1768 IEEE80211_ADDR_COPY(MC01(mc)->mc_addr4,
1769 eh.ether_shost);
1770 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
1771 break;
1772 case IEEE80211_MESH_AE_10: /* ucast, proxy */
1773 KASSERT(rt != NULL, ("route is NULL"));
1774 IEEE80211_ADDR_COPY(wh->i_addr1, rt->rt_nexthop);
1775 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1776 IEEE80211_ADDR_COPY(wh->i_addr3, rt->rt_mesh_gate);
1777 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr);
1778 mc->mc_flags = IEEE80211_MESH_AE_10;
1779 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_dhost);
1780 IEEE80211_ADDR_COPY(mc->mc_addr6, eh.ether_shost);
1781 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
1782 break;
1783 default:
1784 KASSERT(0, ("meshae %d", meshae));
1785 break;
1786 }
1787 mc->mc_ttl = ms->ms_ttl;
1788 ms->ms_seq++;
1789 le32enc(mc->mc_seq, ms->ms_seq);
1790 break;
1791 #endif
1792 case IEEE80211_M_WDS: /* NB: is4addr should always be true */
1793 default:
1794 goto bad;
1795 }
1796 if (m->m_flags & M_MORE_DATA)
1797 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
1798 if (addqos) {
1799 int ac, tid;
1800
1801 if (is4addr) {
1802 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
1803 /* NB: mesh case handled earlier */
1804 } else if (vap->iv_opmode != IEEE80211_M_MBSS)
1805 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
1806 ac = M_WME_GETAC(m);
1807 /* map from access class/queue to 11e header priorty value */
1808 tid = WME_AC_TO_TID(ac);
1809 qos[0] = tid & IEEE80211_QOS_TID;
1810 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy)
1811 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
1812 #ifdef IEEE80211_SUPPORT_MESH
1813 if (vap->iv_opmode == IEEE80211_M_MBSS)
1814 qos[1] = IEEE80211_QOS_MC;
1815 else
1816 #endif
1817 qos[1] = 0;
1818 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS_DATA;
1819
1820 /*
1821 * If this is an A-MSDU then ensure we set the
1822 * relevant field.
1823 */
1824 if (is_amsdu)
1825 qos[0] |= IEEE80211_QOS_AMSDU;
1826
1827 /*
1828 * XXX TODO TX lock is needed for atomic updates of sequence
1829 * numbers. If the driver does it, then don't do it here;
1830 * and we don't need the TX lock held.
1831 */
1832 if ((m->m_flags & M_AMPDU_MPDU) == 0) {
1833 /*
1834 * 802.11-2012 9.3.2.10 -
1835 *
1836 * If this is a multicast frame then we need
1837 * to ensure that the sequence number comes from
1838 * a separate seqno space and not the TID space.
1839 *
1840 * Otherwise multicast frames may actually cause
1841 * holes in the TX blockack window space and
1842 * upset various things.
1843 */
1844 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
1845 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
1846 else
1847 seqno = ni->ni_txseqs[tid]++;
1848
1849 /*
1850 * NB: don't assign a sequence # to potential
1851 * aggregates; we expect this happens at the
1852 * point the frame comes off any aggregation q
1853 * as otherwise we may introduce holes in the
1854 * BA sequence space and/or make window accouting
1855 * more difficult.
1856 *
1857 * XXX may want to control this with a driver
1858 * capability; this may also change when we pull
1859 * aggregation up into net80211
1860 */
1861 *(uint16_t *)wh->i_seq =
1862 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
1863 M_SEQNO_SET(m, seqno);
1864 } else {
1865 /* NB: zero out i_seq field (for s/w encryption etc) */
1866 *(uint16_t *)wh->i_seq = 0;
1867 }
1868 } else {
1869 /*
1870 * XXX TODO TX lock is needed for atomic updates of sequence
1871 * numbers. If the driver does it, then don't do it here;
1872 * and we don't need the TX lock held.
1873 */
1874 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
1875 *(uint16_t *)wh->i_seq =
1876 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
1877 M_SEQNO_SET(m, seqno);
1878
1879 /*
1880 * XXX TODO: we shouldn't allow EAPOL, etc that would
1881 * be forced to be non-QoS traffic to be A-MSDU encapsulated.
1882 */
1883 if (is_amsdu)
1884 printf("%s: XXX ERROR: is_amsdu set; not QoS!\n",
1885 __func__);
1886 }
1887
1888 /*
1889 * Check if xmit fragmentation is required.
1890 *
1891 * If the hardware does fragmentation offload, then don't bother
1892 * doing it here.
1893 */
1894 if (IEEE80211_CONF_FRAG_OFFLOAD(ic))
1895 txfrag = 0;
1896 else
1897 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold &&
1898 !IEEE80211_IS_MULTICAST(wh->i_addr1) &&
1899 (vap->iv_caps & IEEE80211_C_TXFRAG) &&
1900 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0);
1901
1902 if (key != NULL) {
1903 /*
1904 * IEEE 802.1X: send EAPOL frames always in the clear.
1905 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set.
1906 */
1907 if ((m->m_flags & M_EAPOL) == 0 ||
1908 ((vap->iv_flags & IEEE80211_F_WPA) &&
1909 (vap->iv_opmode == IEEE80211_M_STA ?
1910 !IEEE80211_KEY_UNDEFINED(key) :
1911 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) {
1912 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED;
1913 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) {
1914 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT,
1915 eh.ether_dhost,
1916 "%s", "enmic failed, discard frame");
1917 vap->iv_stats.is_crypto_enmicfail++;
1918 goto bad;
1919 }
1920 }
1921 }
1922 if (txfrag && !ieee80211_fragment(vap, m, hdrsize,
1923 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold))
1924 goto bad;
1925
1926 m->m_flags |= M_ENCAP; /* mark encapsulated */
1927
1928 IEEE80211_NODE_STAT(ni, tx_data);
1929 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1930 IEEE80211_NODE_STAT(ni, tx_mcast);
1931 m->m_flags |= M_MCAST;
1932 } else
1933 IEEE80211_NODE_STAT(ni, tx_ucast);
1934 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen);
1935
1936 return m;
1937 bad:
1938 if (m != NULL)
1939 m_freem(m);
1940 return NULL;
1941 #undef WH4
1942 #undef MC01
1943 }
1944
1945 void
ieee80211_free_mbuf(struct mbuf * m)1946 ieee80211_free_mbuf(struct mbuf *m)
1947 {
1948 struct mbuf *next;
1949
1950 if (m == NULL)
1951 return;
1952
1953 do {
1954 next = m->m_nextpkt;
1955 m->m_nextpkt = NULL;
1956 m_freem(m);
1957 } while ((m = next) != NULL);
1958 }
1959
1960 /*
1961 * Fragment the frame according to the specified mtu.
1962 * The size of the 802.11 header (w/o padding) is provided
1963 * so we don't need to recalculate it. We create a new
1964 * mbuf for each fragment and chain it through m_nextpkt;
1965 * we might be able to optimize this by reusing the original
1966 * packet's mbufs but that is significantly more complicated.
1967 */
1968 static int
ieee80211_fragment(struct ieee80211vap * vap,struct mbuf * m0,u_int hdrsize,u_int ciphdrsize,u_int mtu)1969 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0,
1970 u_int hdrsize, u_int ciphdrsize, u_int mtu)
1971 {
1972 struct ieee80211com *ic = vap->iv_ic;
1973 struct ieee80211_frame *wh, *whf;
1974 struct mbuf *m, *prev;
1975 u_int totalhdrsize, fragno, fragsize, off, remainder, payload;
1976 u_int hdrspace;
1977
1978 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?"));
1979 KASSERT(m0->m_pkthdr.len > mtu,
1980 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu));
1981
1982 /*
1983 * Honor driver DATAPAD requirement.
1984 */
1985 if (ic->ic_flags & IEEE80211_F_DATAPAD)
1986 hdrspace = roundup(hdrsize, sizeof(uint32_t));
1987 else
1988 hdrspace = hdrsize;
1989
1990 wh = mtod(m0, struct ieee80211_frame *);
1991 /* NB: mark the first frag; it will be propagated below */
1992 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG;
1993 totalhdrsize = hdrspace + ciphdrsize;
1994 fragno = 1;
1995 off = mtu - ciphdrsize;
1996 remainder = m0->m_pkthdr.len - off;
1997 prev = m0;
1998 do {
1999 fragsize = MIN(totalhdrsize + remainder, mtu);
2000 m = m_get2(fragsize, IEEE80211_M_NOWAIT, MT_DATA, M_PKTHDR);
2001 if (m == NULL)
2002 goto bad;
2003 /* leave room to prepend any cipher header */
2004 m_align(m, fragsize - ciphdrsize);
2005
2006 /*
2007 * Form the header in the fragment. Note that since
2008 * we mark the first fragment with the MORE_FRAG bit
2009 * it automatically is propagated to each fragment; we
2010 * need only clear it on the last fragment (done below).
2011 * NB: frag 1+ dont have Mesh Control field present.
2012 */
2013 whf = mtod(m, struct ieee80211_frame *);
2014 memcpy(whf, wh, hdrsize);
2015 #ifdef IEEE80211_SUPPORT_MESH
2016 if (vap->iv_opmode == IEEE80211_M_MBSS)
2017 ieee80211_getqos(wh)[1] &= ~IEEE80211_QOS_MC;
2018 #endif
2019 *(uint16_t *)&whf->i_seq[0] |= htole16(
2020 (fragno & IEEE80211_SEQ_FRAG_MASK) <<
2021 IEEE80211_SEQ_FRAG_SHIFT);
2022 fragno++;
2023
2024 payload = fragsize - totalhdrsize;
2025 /* NB: destination is known to be contiguous */
2026
2027 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrspace);
2028 m->m_len = hdrspace + payload;
2029 m->m_pkthdr.len = hdrspace + payload;
2030 m->m_flags |= M_FRAG;
2031
2032 /* chain up the fragment */
2033 prev->m_nextpkt = m;
2034 prev = m;
2035
2036 /* deduct fragment just formed */
2037 remainder -= payload;
2038 off += payload;
2039 } while (remainder != 0);
2040
2041 /* set the last fragment */
2042 m->m_flags |= M_LASTFRAG;
2043 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG;
2044
2045 /* strip first mbuf now that everything has been copied */
2046 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize)));
2047 m0->m_flags |= M_FIRSTFRAG | M_FRAG;
2048
2049 vap->iv_stats.is_tx_fragframes++;
2050 vap->iv_stats.is_tx_frags += fragno-1;
2051
2052 return 1;
2053 bad:
2054 /* reclaim fragments but leave original frame for caller to free */
2055 ieee80211_free_mbuf(m0->m_nextpkt);
2056 m0->m_nextpkt = NULL;
2057 return 0;
2058 }
2059
2060 /*
2061 * Add a supported rates element id to a frame.
2062 */
2063 uint8_t *
ieee80211_add_rates(uint8_t * frm,const struct ieee80211_rateset * rs)2064 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs)
2065 {
2066 int nrates;
2067
2068 *frm++ = IEEE80211_ELEMID_RATES;
2069 nrates = rs->rs_nrates;
2070 if (nrates > IEEE80211_RATE_SIZE)
2071 nrates = IEEE80211_RATE_SIZE;
2072 *frm++ = nrates;
2073 memcpy(frm, rs->rs_rates, nrates);
2074 return frm + nrates;
2075 }
2076
2077 /*
2078 * Add an extended supported rates element id to a frame.
2079 */
2080 uint8_t *
ieee80211_add_xrates(uint8_t * frm,const struct ieee80211_rateset * rs)2081 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs)
2082 {
2083 /*
2084 * Add an extended supported rates element if operating in 11g mode.
2085 */
2086 if (rs->rs_nrates > IEEE80211_RATE_SIZE) {
2087 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE;
2088 *frm++ = IEEE80211_ELEMID_XRATES;
2089 *frm++ = nrates;
2090 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates);
2091 frm += nrates;
2092 }
2093 return frm;
2094 }
2095
2096 /*
2097 * Add an ssid element to a frame.
2098 */
2099 uint8_t *
ieee80211_add_ssid(uint8_t * frm,const uint8_t * ssid,u_int len)2100 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len)
2101 {
2102 *frm++ = IEEE80211_ELEMID_SSID;
2103 *frm++ = len;
2104 memcpy(frm, ssid, len);
2105 return frm + len;
2106 }
2107
2108 /*
2109 * Add an erp element to a frame.
2110 */
2111 static uint8_t *
ieee80211_add_erp(uint8_t * frm,struct ieee80211vap * vap)2112 ieee80211_add_erp(uint8_t *frm, struct ieee80211vap *vap)
2113 {
2114 struct ieee80211com *ic = vap->iv_ic;
2115 uint8_t erp;
2116
2117 *frm++ = IEEE80211_ELEMID_ERP;
2118 *frm++ = 1;
2119 erp = 0;
2120
2121 /*
2122 * TODO: This uses the global flags for now because
2123 * the per-VAP flags are fine for per-VAP, but don't
2124 * take into account which VAPs share the same channel
2125 * and which are on different channels.
2126 *
2127 * ERP and HT/VHT protection mode is a function of
2128 * how many stations are on a channel, not specifically
2129 * the VAP or global. But, until we grow that status,
2130 * the global flag will have to do.
2131 */
2132 if (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR)
2133 erp |= IEEE80211_ERP_NON_ERP_PRESENT;
2134
2135 /*
2136 * TODO: same as above; these should be based not
2137 * on the vap or ic flags, but instead on a combination
2138 * of per-VAP and channels.
2139 */
2140 if (ic->ic_flags & IEEE80211_F_USEPROT)
2141 erp |= IEEE80211_ERP_USE_PROTECTION;
2142 if (ic->ic_flags & IEEE80211_F_USEBARKER)
2143 erp |= IEEE80211_ERP_LONG_PREAMBLE;
2144 *frm++ = erp;
2145 return frm;
2146 }
2147
2148 /*
2149 * Add a CFParams element to a frame.
2150 */
2151 static uint8_t *
ieee80211_add_cfparms(uint8_t * frm,struct ieee80211com * ic)2152 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic)
2153 {
2154 #define ADDSHORT(frm, v) do { \
2155 le16enc(frm, v); \
2156 frm += 2; \
2157 } while (0)
2158 *frm++ = IEEE80211_ELEMID_CFPARMS;
2159 *frm++ = 6;
2160 *frm++ = 0; /* CFP count */
2161 *frm++ = 2; /* CFP period */
2162 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */
2163 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */
2164 return frm;
2165 #undef ADDSHORT
2166 }
2167
2168 static __inline uint8_t *
add_appie(uint8_t * frm,const struct ieee80211_appie * ie)2169 add_appie(uint8_t *frm, const struct ieee80211_appie *ie)
2170 {
2171 memcpy(frm, ie->ie_data, ie->ie_len);
2172 return frm + ie->ie_len;
2173 }
2174
2175 static __inline uint8_t *
add_ie(uint8_t * frm,const uint8_t * ie)2176 add_ie(uint8_t *frm, const uint8_t *ie)
2177 {
2178 memcpy(frm, ie, 2 + ie[1]);
2179 return frm + 2 + ie[1];
2180 }
2181
2182 #define WME_OUI_BYTES 0x00, 0x50, 0xf2
2183 /*
2184 * Add a WME information element to a frame.
2185 */
2186 uint8_t *
ieee80211_add_wme_info(uint8_t * frm,struct ieee80211_wme_state * wme,struct ieee80211_node * ni)2187 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme,
2188 struct ieee80211_node *ni)
2189 {
2190 static const uint8_t oui[4] = { WME_OUI_BYTES, WME_OUI_TYPE };
2191 struct ieee80211vap *vap = ni->ni_vap;
2192
2193 *frm++ = IEEE80211_ELEMID_VENDOR;
2194 *frm++ = sizeof(struct ieee80211_wme_info) - 2;
2195 memcpy(frm, oui, sizeof(oui));
2196 frm += sizeof(oui);
2197 *frm++ = WME_INFO_OUI_SUBTYPE;
2198 *frm++ = WME_VERSION;
2199
2200 /* QoS info field depends upon operating mode */
2201 switch (vap->iv_opmode) {
2202 case IEEE80211_M_HOSTAP:
2203 *frm = wme->wme_bssChanParams.cap_info;
2204 if (vap->iv_flags_ext & IEEE80211_FEXT_UAPSD)
2205 *frm |= WME_CAPINFO_UAPSD_EN;
2206 frm++;
2207 break;
2208 case IEEE80211_M_STA:
2209 /*
2210 * NB: UAPSD drivers must set this up in their
2211 * VAP creation method.
2212 */
2213 *frm++ = vap->iv_uapsdinfo;
2214 break;
2215 default:
2216 *frm++ = 0;
2217 break;
2218 }
2219
2220 return frm;
2221 }
2222
2223 /*
2224 * Add a WME parameters element to a frame.
2225 */
2226 static uint8_t *
ieee80211_add_wme_param(uint8_t * frm,struct ieee80211_wme_state * wme,int uapsd_enable)2227 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme,
2228 int uapsd_enable)
2229 {
2230 #define ADDSHORT(frm, v) do { \
2231 le16enc(frm, v); \
2232 frm += 2; \
2233 } while (0)
2234 /* NB: this works 'cuz a param has an info at the front */
2235 static const struct ieee80211_wme_info param = {
2236 .wme_id = IEEE80211_ELEMID_VENDOR,
2237 .wme_len = sizeof(struct ieee80211_wme_param) - 2,
2238 .wme_oui = { WME_OUI_BYTES },
2239 .wme_type = WME_OUI_TYPE,
2240 .wme_subtype = WME_PARAM_OUI_SUBTYPE,
2241 .wme_version = WME_VERSION,
2242 };
2243 int i;
2244
2245 memcpy(frm, ¶m, sizeof(param));
2246 frm += __offsetof(struct ieee80211_wme_info, wme_info);
2247 *frm = wme->wme_bssChanParams.cap_info; /* AC info */
2248 if (uapsd_enable)
2249 *frm |= WME_CAPINFO_UAPSD_EN;
2250 frm++;
2251 *frm++ = 0; /* reserved field */
2252 /* XXX TODO - U-APSD bits - SP, flags below */
2253 for (i = 0; i < WME_NUM_AC; i++) {
2254 const struct wmeParams *ac =
2255 &wme->wme_bssChanParams.cap_wmeParams[i];
2256 *frm++ = _IEEE80211_SHIFTMASK(i, WME_PARAM_ACI)
2257 | _IEEE80211_SHIFTMASK(ac->wmep_acm, WME_PARAM_ACM)
2258 | _IEEE80211_SHIFTMASK(ac->wmep_aifsn, WME_PARAM_AIFSN)
2259 ;
2260 *frm++ = _IEEE80211_SHIFTMASK(ac->wmep_logcwmax,
2261 WME_PARAM_LOGCWMAX)
2262 | _IEEE80211_SHIFTMASK(ac->wmep_logcwmin,
2263 WME_PARAM_LOGCWMIN)
2264 ;
2265 ADDSHORT(frm, ac->wmep_txopLimit);
2266 }
2267 return frm;
2268 #undef ADDSHORT
2269 }
2270 #undef WME_OUI_BYTES
2271
2272 /*
2273 * Add an 11h Power Constraint element to a frame.
2274 */
2275 static uint8_t *
ieee80211_add_powerconstraint(uint8_t * frm,struct ieee80211vap * vap)2276 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap)
2277 {
2278 const struct ieee80211_channel *c = vap->iv_bss->ni_chan;
2279 /* XXX per-vap tx power limit? */
2280 int8_t limit = vap->iv_ic->ic_txpowlimit / 2;
2281
2282 frm[0] = IEEE80211_ELEMID_PWRCNSTR;
2283 frm[1] = 1;
2284 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0;
2285 return frm + 3;
2286 }
2287
2288 /*
2289 * Add an 11h Power Capability element to a frame.
2290 */
2291 static uint8_t *
ieee80211_add_powercapability(uint8_t * frm,const struct ieee80211_channel * c)2292 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c)
2293 {
2294 frm[0] = IEEE80211_ELEMID_PWRCAP;
2295 frm[1] = 2;
2296 frm[2] = c->ic_minpower;
2297 frm[3] = c->ic_maxpower;
2298 return frm + 4;
2299 }
2300
2301 /*
2302 * Add an 11h Supported Channels element to a frame.
2303 */
2304 static uint8_t *
ieee80211_add_supportedchannels(uint8_t * frm,struct ieee80211com * ic)2305 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic)
2306 {
2307 static const int ielen = 26;
2308
2309 frm[0] = IEEE80211_ELEMID_SUPPCHAN;
2310 frm[1] = ielen;
2311 /* XXX not correct */
2312 memcpy(frm+2, ic->ic_chan_avail, ielen);
2313 return frm + 2 + ielen;
2314 }
2315
2316 /*
2317 * Add an 11h Quiet time element to a frame.
2318 */
2319 static uint8_t *
ieee80211_add_quiet(uint8_t * frm,struct ieee80211vap * vap,int update)2320 ieee80211_add_quiet(uint8_t *frm, struct ieee80211vap *vap, int update)
2321 {
2322 struct ieee80211_quiet_ie *quiet = (struct ieee80211_quiet_ie *) frm;
2323
2324 quiet->quiet_ie = IEEE80211_ELEMID_QUIET;
2325 quiet->len = 6;
2326
2327 /*
2328 * Only update every beacon interval - otherwise probe responses
2329 * would update the quiet count value.
2330 */
2331 if (update) {
2332 if (vap->iv_quiet_count_value == 1)
2333 vap->iv_quiet_count_value = vap->iv_quiet_count;
2334 else if (vap->iv_quiet_count_value > 1)
2335 vap->iv_quiet_count_value--;
2336 }
2337
2338 if (vap->iv_quiet_count_value == 0) {
2339 /* value 0 is reserved as per 802.11h standerd */
2340 vap->iv_quiet_count_value = 1;
2341 }
2342
2343 quiet->tbttcount = vap->iv_quiet_count_value;
2344 quiet->period = vap->iv_quiet_period;
2345 quiet->duration = htole16(vap->iv_quiet_duration);
2346 quiet->offset = htole16(vap->iv_quiet_offset);
2347 return frm + sizeof(*quiet);
2348 }
2349
2350 /*
2351 * Add an 11h Channel Switch Announcement element to a frame.
2352 * Note that we use the per-vap CSA count to adjust the global
2353 * counter so we can use this routine to form probe response
2354 * frames and get the current count.
2355 */
2356 static uint8_t *
ieee80211_add_csa(uint8_t * frm,struct ieee80211vap * vap)2357 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap)
2358 {
2359 struct ieee80211com *ic = vap->iv_ic;
2360 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm;
2361
2362 csa->csa_ie = IEEE80211_ELEMID_CSA;
2363 csa->csa_len = 3;
2364 csa->csa_mode = 1; /* XXX force quiet on channel */
2365 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan);
2366 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count;
2367 return frm + sizeof(*csa);
2368 }
2369
2370 /*
2371 * Add an 11h country information element to a frame.
2372 */
2373 static uint8_t *
ieee80211_add_countryie(uint8_t * frm,struct ieee80211com * ic)2374 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic)
2375 {
2376
2377 if (ic->ic_countryie == NULL ||
2378 ic->ic_countryie_chan != ic->ic_bsschan) {
2379 /*
2380 * Handle lazy construction of ie. This is done on
2381 * first use and after a channel change that requires
2382 * re-calculation.
2383 */
2384 if (ic->ic_countryie != NULL)
2385 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE);
2386 ic->ic_countryie = ieee80211_alloc_countryie(ic);
2387 if (ic->ic_countryie == NULL)
2388 return frm;
2389 ic->ic_countryie_chan = ic->ic_bsschan;
2390 }
2391 return add_appie(frm, ic->ic_countryie);
2392 }
2393
2394 uint8_t *
ieee80211_add_wpa(uint8_t * frm,const struct ieee80211vap * vap)2395 ieee80211_add_wpa(uint8_t *frm, const struct ieee80211vap *vap)
2396 {
2397 if (vap->iv_flags & IEEE80211_F_WPA1 && vap->iv_wpa_ie != NULL)
2398 return (add_ie(frm, vap->iv_wpa_ie));
2399 else {
2400 /* XXX else complain? */
2401 return (frm);
2402 }
2403 }
2404
2405 uint8_t *
ieee80211_add_rsn(uint8_t * frm,const struct ieee80211vap * vap)2406 ieee80211_add_rsn(uint8_t *frm, const struct ieee80211vap *vap)
2407 {
2408 if (vap->iv_flags & IEEE80211_F_WPA2 && vap->iv_rsn_ie != NULL)
2409 return (add_ie(frm, vap->iv_rsn_ie));
2410 else {
2411 /* XXX else complain? */
2412 return (frm);
2413 }
2414 }
2415
2416 uint8_t *
ieee80211_add_qos(uint8_t * frm,const struct ieee80211_node * ni)2417 ieee80211_add_qos(uint8_t *frm, const struct ieee80211_node *ni)
2418 {
2419 if (ni->ni_flags & IEEE80211_NODE_QOS) {
2420 *frm++ = IEEE80211_ELEMID_QOS;
2421 *frm++ = 1;
2422 *frm++ = 0;
2423 }
2424
2425 return (frm);
2426 }
2427
2428 /*
2429 * ieee80211_send_probereq(): send a probe request frame with the specified ssid
2430 * and any optional information element data; some helper functions as FW based
2431 * HW scans need some of that information passed too.
2432 */
2433 static uint32_t
ieee80211_probereq_ie_len(struct ieee80211vap * vap,struct ieee80211com * ic)2434 ieee80211_probereq_ie_len(struct ieee80211vap *vap, struct ieee80211com *ic)
2435 {
2436 const struct ieee80211_rateset *rs;
2437
2438 rs = ieee80211_get_suprates(ic, ic->ic_curchan);
2439
2440 /*
2441 * prreq frame format
2442 * [tlv] ssid
2443 * [tlv] supported rates
2444 * [tlv] extended supported rates (if needed)
2445 * [tlv] HT cap (optional)
2446 * [tlv] VHT cap (optional)
2447 * [tlv] WPA (optional)
2448 * [tlv] user-specified ie's
2449 */
2450 return ( 2 + IEEE80211_NWID_LEN
2451 + 2 + IEEE80211_RATE_SIZE
2452 + ((rs->rs_nrates > IEEE80211_RATE_SIZE) ?
2453 2 + (rs->rs_nrates - IEEE80211_RATE_SIZE) : 0)
2454 + (((vap->iv_opmode == IEEE80211_M_IBSS) &&
2455 (vap->iv_flags_ht & IEEE80211_FHT_HT)) ?
2456 sizeof(struct ieee80211_ie_htcap) : 0)
2457 #ifdef notyet
2458 + sizeof(struct ieee80211_ie_htinfo) /* XXX not needed? */
2459 + 2 + sizeof(struct ieee80211_vht_cap)
2460 #endif
2461 + ((vap->iv_flags & IEEE80211_F_WPA1 && vap->iv_wpa_ie != NULL) ?
2462 vap->iv_wpa_ie[1] : 0)
2463 + (vap->iv_appie_probereq != NULL ?
2464 vap->iv_appie_probereq->ie_len : 0)
2465 );
2466 }
2467
2468 int
ieee80211_probereq_ie(struct ieee80211vap * vap,struct ieee80211com * ic,uint8_t ** frmp,uint32_t * frmlen,const uint8_t * ssid,size_t ssidlen,bool alloc)2469 ieee80211_probereq_ie(struct ieee80211vap *vap, struct ieee80211com *ic,
2470 uint8_t **frmp, uint32_t *frmlen, const uint8_t *ssid, size_t ssidlen,
2471 bool alloc)
2472 {
2473 const struct ieee80211_rateset *rs;
2474 uint8_t *frm;
2475 uint32_t len;
2476
2477 if (!alloc && (frmp == NULL || frmlen == NULL))
2478 return (EINVAL);
2479
2480 len = ieee80211_probereq_ie_len(vap, ic);
2481 if (!alloc && len > *frmlen)
2482 return (ENOBUFS);
2483
2484 /* For HW scans we usually do not pass in the SSID as IE. */
2485 if (ssidlen == -1)
2486 len -= (2 + IEEE80211_NWID_LEN);
2487
2488 if (alloc) {
2489 frm = IEEE80211_MALLOC(len, M_80211_VAP,
2490 IEEE80211_M_WAITOK | IEEE80211_M_ZERO);
2491 *frmp = frm;
2492 *frmlen = len;
2493 } else
2494 frm = *frmp;
2495
2496 if (ssidlen != -1)
2497 frm = ieee80211_add_ssid(frm, ssid, ssidlen);
2498 rs = ieee80211_get_suprates(ic, ic->ic_curchan);
2499 frm = ieee80211_add_rates(frm, rs);
2500 frm = ieee80211_add_xrates(frm, rs);
2501
2502 /*
2503 * Note: we can't use bss; we don't have one yet.
2504 *
2505 * So, we should announce our capabilities
2506 * in this channel mode (2g/5g), not the
2507 * channel details itself.
2508 */
2509 if ((vap->iv_opmode == IEEE80211_M_IBSS) &&
2510 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
2511 struct ieee80211_channel *c;
2512
2513 /*
2514 * Get the HT channel that we should try upgrading to.
2515 * If we can do 40MHz then this'll upgrade it appropriately.
2516 */
2517 c = ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
2518 vap->iv_flags_ht);
2519 frm = ieee80211_add_htcap_ch(frm, vap, c);
2520 }
2521
2522 /*
2523 * XXX TODO: need to figure out what/how to update the
2524 * VHT channel.
2525 */
2526 #ifdef notyet
2527 if (vap->iv_vht_flags & IEEE80211_FVHT_VHT) {
2528 struct ieee80211_channel *c;
2529
2530 c = ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
2531 vap->iv_flags_ht);
2532 c = ieee80211_vht_adjust_channel(ic, c, vap->iv_vht_flags);
2533 frm = ieee80211_add_vhtcap_ch(frm, vap, c);
2534 }
2535 #endif
2536
2537 frm = ieee80211_add_wpa(frm, vap);
2538 if (vap->iv_appie_probereq != NULL)
2539 frm = add_appie(frm, vap->iv_appie_probereq);
2540
2541 if (!alloc) {
2542 *frmp = frm;
2543 *frmlen = len;
2544 }
2545
2546 return (0);
2547 }
2548
2549 int
ieee80211_send_probereq(struct ieee80211_node * ni,const uint8_t sa[IEEE80211_ADDR_LEN],const uint8_t da[IEEE80211_ADDR_LEN],const uint8_t bssid[IEEE80211_ADDR_LEN],const uint8_t * ssid,size_t ssidlen)2550 ieee80211_send_probereq(struct ieee80211_node *ni,
2551 const uint8_t sa[IEEE80211_ADDR_LEN],
2552 const uint8_t da[IEEE80211_ADDR_LEN],
2553 const uint8_t bssid[IEEE80211_ADDR_LEN],
2554 const uint8_t *ssid, size_t ssidlen)
2555 {
2556 struct ieee80211vap *vap = ni->ni_vap;
2557 struct ieee80211com *ic = ni->ni_ic;
2558 struct ieee80211_node *bss;
2559 const struct ieee80211_txparam *tp;
2560 struct ieee80211_bpf_params params;
2561 struct mbuf *m;
2562 uint8_t *frm;
2563 uint32_t frmlen;
2564 int ret;
2565
2566 bss = ieee80211_ref_node(vap->iv_bss);
2567
2568 if (vap->iv_state == IEEE80211_S_CAC) {
2569 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
2570 "block %s frame in CAC state", "probe request");
2571 vap->iv_stats.is_tx_badstate++;
2572 ieee80211_free_node(bss);
2573 return EIO; /* XXX */
2574 }
2575
2576 /*
2577 * Hold a reference on the node so it doesn't go away until after
2578 * the xmit is complete all the way in the driver. On error we
2579 * will remove our reference.
2580 */
2581 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2582 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
2583 __func__, __LINE__,
2584 ni, ether_sprintf(ni->ni_macaddr),
2585 ieee80211_node_refcnt(ni)+1);
2586 ieee80211_ref_node(ni);
2587
2588 /* See comments above for entire frame format. */
2589 frmlen = ieee80211_probereq_ie_len(vap, ic);
2590 m = ieee80211_getmgtframe(&frm,
2591 ic->ic_headroom + sizeof(struct ieee80211_frame), frmlen);
2592 if (m == NULL) {
2593 vap->iv_stats.is_tx_nobuf++;
2594 ieee80211_free_node(ni);
2595 ieee80211_free_node(bss);
2596 return ENOMEM;
2597 }
2598
2599 ret = ieee80211_probereq_ie(vap, ic, &frm, &frmlen, ssid, ssidlen,
2600 false);
2601 KASSERT(ret == 0,
2602 ("%s: ieee80211_probereq_ie failed: %d\n", __func__, ret));
2603
2604 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2605 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame),
2606 ("leading space %zd", M_LEADINGSPACE(m)));
2607 M_PREPEND(m, sizeof(struct ieee80211_frame), IEEE80211_M_NOWAIT);
2608 if (m == NULL) {
2609 /* NB: cannot happen */
2610 ieee80211_free_node(ni);
2611 ieee80211_free_node(bss);
2612 return ENOMEM;
2613 }
2614
2615 IEEE80211_TX_LOCK(ic);
2616 ieee80211_send_setup(ni, m,
2617 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ,
2618 IEEE80211_NONQOS_TID, sa, da, bssid);
2619 /* XXX power management? */
2620 m->m_flags |= M_ENCAP; /* mark encapsulated */
2621
2622 M_WME_SETAC(m, WME_AC_BE);
2623
2624 IEEE80211_NODE_STAT(ni, tx_probereq);
2625 IEEE80211_NODE_STAT(ni, tx_mgmt);
2626
2627 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
2628 "send probe req on channel %u bssid %s sa %6D da %6D ssid \"%.*s\"\n",
2629 ieee80211_chan2ieee(ic, ic->ic_curchan),
2630 ether_sprintf(bssid),
2631 sa, ":",
2632 da, ":",
2633 ssidlen, ssid);
2634
2635 memset(¶ms, 0, sizeof(params));
2636 params.ibp_pri = M_WME_GETAC(m);
2637 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
2638 params.ibp_rate0 = tp->mgmtrate;
2639 if (IEEE80211_IS_MULTICAST(da)) {
2640 params.ibp_flags |= IEEE80211_BPF_NOACK;
2641 params.ibp_try0 = 1;
2642 } else
2643 params.ibp_try0 = tp->maxretry;
2644 params.ibp_power = ni->ni_txpower;
2645 ret = ieee80211_raw_output(vap, ni, m, ¶ms);
2646 IEEE80211_TX_UNLOCK(ic);
2647 ieee80211_free_node(bss);
2648 return (ret);
2649 }
2650
2651 /*
2652 * Calculate capability information for mgt frames.
2653 */
2654 uint16_t
ieee80211_getcapinfo(struct ieee80211vap * vap,struct ieee80211_channel * chan)2655 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan)
2656 {
2657 uint16_t capinfo;
2658
2659 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode"));
2660
2661 if (vap->iv_opmode == IEEE80211_M_HOSTAP)
2662 capinfo = IEEE80211_CAPINFO_ESS;
2663 else if (vap->iv_opmode == IEEE80211_M_IBSS)
2664 capinfo = IEEE80211_CAPINFO_IBSS;
2665 else
2666 capinfo = 0;
2667 if (vap->iv_flags & IEEE80211_F_PRIVACY)
2668 capinfo |= IEEE80211_CAPINFO_PRIVACY;
2669 if ((vap->iv_flags & IEEE80211_F_SHPREAMBLE) &&
2670 IEEE80211_IS_CHAN_2GHZ(chan))
2671 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
2672 if (vap->iv_flags & IEEE80211_F_SHSLOT)
2673 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
2674 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH))
2675 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
2676 return capinfo;
2677 }
2678
2679 /*
2680 * Send a management frame. The node is for the destination (or ic_bss
2681 * when in station mode). Nodes other than ic_bss have their reference
2682 * count bumped to reflect our use for an indeterminant time.
2683 */
2684 int
ieee80211_send_mgmt(struct ieee80211_node * ni,int type,int arg)2685 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg)
2686 {
2687 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT)
2688 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2689 struct ieee80211vap *vap = ni->ni_vap;
2690 struct ieee80211com *ic = ni->ni_ic;
2691 struct ieee80211_node *bss = vap->iv_bss;
2692 struct ieee80211_bpf_params params;
2693 struct mbuf *m;
2694 uint8_t *frm;
2695 uint16_t capinfo;
2696 int has_challenge, is_shared_key, ret, status;
2697
2698 KASSERT(ni != NULL, ("null node"));
2699
2700 /*
2701 * Hold a reference on the node so it doesn't go away until after
2702 * the xmit is complete all the way in the driver. On error we
2703 * will remove our reference.
2704 */
2705 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2706 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
2707 __func__, __LINE__,
2708 ni, ether_sprintf(ni->ni_macaddr),
2709 ieee80211_node_refcnt(ni)+1);
2710 ieee80211_ref_node(ni);
2711
2712 memset(¶ms, 0, sizeof(params));
2713 switch (type) {
2714 case IEEE80211_FC0_SUBTYPE_AUTH:
2715 status = arg >> 16;
2716 arg &= 0xffff;
2717 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE ||
2718 arg == IEEE80211_AUTH_SHARED_RESPONSE) &&
2719 ni->ni_challenge != NULL);
2720
2721 /*
2722 * Deduce whether we're doing open authentication or
2723 * shared key authentication. We do the latter if
2724 * we're in the middle of a shared key authentication
2725 * handshake or if we're initiating an authentication
2726 * request and configured to use shared key.
2727 */
2728 is_shared_key = has_challenge ||
2729 arg >= IEEE80211_AUTH_SHARED_RESPONSE ||
2730 (arg == IEEE80211_AUTH_SHARED_REQUEST &&
2731 bss->ni_authmode == IEEE80211_AUTH_SHARED);
2732
2733 m = ieee80211_getmgtframe(&frm,
2734 ic->ic_headroom + sizeof(struct ieee80211_frame),
2735 3 * sizeof(uint16_t)
2736 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ?
2737 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0));
2738 if (m == NULL)
2739 senderr(ENOMEM, is_tx_nobuf);
2740
2741 ((uint16_t *)frm)[0] =
2742 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED)
2743 : htole16(IEEE80211_AUTH_ALG_OPEN);
2744 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */
2745 ((uint16_t *)frm)[2] = htole16(status);/* status */
2746
2747 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) {
2748 ((uint16_t *)frm)[3] =
2749 htole16((IEEE80211_CHALLENGE_LEN << 8) |
2750 IEEE80211_ELEMID_CHALLENGE);
2751 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge,
2752 IEEE80211_CHALLENGE_LEN);
2753 m->m_pkthdr.len = m->m_len =
2754 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN;
2755 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) {
2756 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2757 "request encrypt frame (%s)", __func__);
2758 /* mark frame for encryption */
2759 params.ibp_flags |= IEEE80211_BPF_CRYPTO;
2760 }
2761 } else
2762 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t);
2763
2764 /* XXX not right for shared key */
2765 if (status == IEEE80211_STATUS_SUCCESS)
2766 IEEE80211_NODE_STAT(ni, tx_auth);
2767 else
2768 IEEE80211_NODE_STAT(ni, tx_auth_fail);
2769
2770 if (vap->iv_opmode == IEEE80211_M_STA)
2771 ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
2772 (void *) vap->iv_state);
2773 break;
2774
2775 case IEEE80211_FC0_SUBTYPE_DEAUTH:
2776 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2777 "send station deauthenticate (reason: %d (%s))", arg,
2778 ieee80211_reason_to_string(arg));
2779 m = ieee80211_getmgtframe(&frm,
2780 ic->ic_headroom + sizeof(struct ieee80211_frame),
2781 sizeof(uint16_t));
2782 if (m == NULL)
2783 senderr(ENOMEM, is_tx_nobuf);
2784 *(uint16_t *)frm = htole16(arg); /* reason */
2785 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
2786
2787 IEEE80211_NODE_STAT(ni, tx_deauth);
2788 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg);
2789
2790 ieee80211_node_unauthorize(ni); /* port closed */
2791 break;
2792
2793 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
2794 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
2795 /*
2796 * asreq frame format
2797 * [2] capability information
2798 * [2] listen interval
2799 * [6*] current AP address (reassoc only)
2800 * [tlv] ssid
2801 * [tlv] supported rates
2802 * [tlv] extended supported rates
2803 * [4] power capability (optional)
2804 * [28] supported channels (optional)
2805 * [tlv] HT capabilities
2806 * [tlv] VHT capabilities
2807 * [tlv] WME (optional)
2808 * [tlv] Vendor OUI HT capabilities (optional)
2809 * [tlv] Atheros capabilities (if negotiated)
2810 * [tlv] AppIE's (optional)
2811 */
2812 m = ieee80211_getmgtframe(&frm,
2813 ic->ic_headroom + sizeof(struct ieee80211_frame),
2814 sizeof(uint16_t)
2815 + sizeof(uint16_t)
2816 + IEEE80211_ADDR_LEN
2817 + 2 + IEEE80211_NWID_LEN
2818 + 2 + IEEE80211_RATE_SIZE
2819 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2820 + 4
2821 + 2 + 26
2822 + sizeof(struct ieee80211_wme_info)
2823 + sizeof(struct ieee80211_ie_htcap)
2824 + 2 + sizeof(struct ieee80211_vht_cap)
2825 + 4 + sizeof(struct ieee80211_ie_htcap)
2826 #ifdef IEEE80211_SUPPORT_SUPERG
2827 + sizeof(struct ieee80211_ath_ie)
2828 #endif
2829 + (vap->iv_appie_wpa != NULL ?
2830 vap->iv_appie_wpa->ie_len : 0)
2831 + (vap->iv_appie_assocreq != NULL ?
2832 vap->iv_appie_assocreq->ie_len : 0)
2833 );
2834 if (m == NULL)
2835 senderr(ENOMEM, is_tx_nobuf);
2836
2837 KASSERT(vap->iv_opmode == IEEE80211_M_STA,
2838 ("wrong mode %u", vap->iv_opmode));
2839 capinfo = IEEE80211_CAPINFO_ESS;
2840 if (vap->iv_flags & IEEE80211_F_PRIVACY)
2841 capinfo |= IEEE80211_CAPINFO_PRIVACY;
2842 /*
2843 * NB: Some 11a AP's reject the request when
2844 * short preamble is set.
2845 */
2846 if ((vap->iv_flags & IEEE80211_F_SHPREAMBLE) &&
2847 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan))
2848 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
2849 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
2850 (ic->ic_caps & IEEE80211_C_SHSLOT))
2851 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
2852 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) &&
2853 (vap->iv_flags & IEEE80211_F_DOTH))
2854 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
2855 *(uint16_t *)frm = htole16(capinfo);
2856 frm += 2;
2857
2858 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!"));
2859 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval,
2860 bss->ni_intval));
2861 frm += 2;
2862
2863 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
2864 IEEE80211_ADDR_COPY(frm, bss->ni_bssid);
2865 frm += IEEE80211_ADDR_LEN;
2866 }
2867
2868 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
2869 frm = ieee80211_add_rates(frm, &ni->ni_rates);
2870 frm = ieee80211_add_rsn(frm, vap);
2871 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
2872 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) {
2873 frm = ieee80211_add_powercapability(frm,
2874 ic->ic_curchan);
2875 frm = ieee80211_add_supportedchannels(frm, ic);
2876 }
2877
2878 /*
2879 * Check the channel - we may be using an 11n NIC with an
2880 * 11n capable station, but we're configured to be an 11b
2881 * channel.
2882 */
2883 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) &&
2884 IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
2885 ni->ni_ies.htcap_ie != NULL &&
2886 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) {
2887 frm = ieee80211_add_htcap(frm, ni);
2888 }
2889
2890 if ((vap->iv_vht_flags & IEEE80211_FVHT_VHT) &&
2891 IEEE80211_IS_CHAN_VHT(ni->ni_chan) &&
2892 ni->ni_ies.vhtcap_ie != NULL &&
2893 ni->ni_ies.vhtcap_ie[0] == IEEE80211_ELEMID_VHT_CAP) {
2894 frm = ieee80211_add_vhtcap(frm, ni);
2895 }
2896
2897 frm = ieee80211_add_wpa(frm, vap);
2898 if ((vap->iv_flags & IEEE80211_F_WME) &&
2899 ni->ni_ies.wme_ie != NULL)
2900 frm = ieee80211_add_wme_info(frm, &ic->ic_wme, ni);
2901
2902 /*
2903 * Same deal - only send HT info if we're on an 11n
2904 * capable channel.
2905 */
2906 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) &&
2907 IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
2908 ni->ni_ies.htcap_ie != NULL &&
2909 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) {
2910 frm = ieee80211_add_htcap_vendor(frm, ni);
2911 }
2912 #ifdef IEEE80211_SUPPORT_SUPERG
2913 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) {
2914 frm = ieee80211_add_ath(frm,
2915 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS),
2916 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
2917 ni->ni_authmode != IEEE80211_AUTH_8021X) ?
2918 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
2919 }
2920 #endif /* IEEE80211_SUPPORT_SUPERG */
2921 if (vap->iv_appie_assocreq != NULL)
2922 frm = add_appie(frm, vap->iv_appie_assocreq);
2923 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2924
2925 ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
2926 (void *) vap->iv_state);
2927 break;
2928
2929 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2930 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2931 /*
2932 * asresp frame format
2933 * [2] capability information
2934 * [2] status
2935 * [2] association ID
2936 * [tlv] supported rates
2937 * [tlv] extended supported rates
2938 * [tlv] HT capabilities (standard, if STA enabled)
2939 * [tlv] HT information (standard, if STA enabled)
2940 * [tlv] VHT capabilities (standard, if STA enabled)
2941 * [tlv] VHT information (standard, if STA enabled)
2942 * [tlv] WME (if configured and STA enabled)
2943 * [tlv] HT capabilities (vendor OUI, if STA enabled)
2944 * [tlv] HT information (vendor OUI, if STA enabled)
2945 * [tlv] Atheros capabilities (if STA enabled)
2946 * [tlv] AppIE's (optional)
2947 */
2948 m = ieee80211_getmgtframe(&frm,
2949 ic->ic_headroom + sizeof(struct ieee80211_frame),
2950 sizeof(uint16_t)
2951 + sizeof(uint16_t)
2952 + sizeof(uint16_t)
2953 + 2 + IEEE80211_RATE_SIZE
2954 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2955 + sizeof(struct ieee80211_ie_htcap) + 4
2956 + sizeof(struct ieee80211_ie_htinfo) + 4
2957 + 2 + sizeof(struct ieee80211_vht_cap)
2958 + 2 + sizeof(struct ieee80211_vht_operation)
2959 + sizeof(struct ieee80211_wme_param)
2960 #ifdef IEEE80211_SUPPORT_SUPERG
2961 + sizeof(struct ieee80211_ath_ie)
2962 #endif
2963 + (vap->iv_appie_assocresp != NULL ?
2964 vap->iv_appie_assocresp->ie_len : 0)
2965 );
2966 if (m == NULL)
2967 senderr(ENOMEM, is_tx_nobuf);
2968
2969 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan);
2970 *(uint16_t *)frm = htole16(capinfo);
2971 frm += 2;
2972
2973 *(uint16_t *)frm = htole16(arg); /* status */
2974 frm += 2;
2975
2976 if (arg == IEEE80211_STATUS_SUCCESS) {
2977 *(uint16_t *)frm = htole16(ni->ni_associd);
2978 IEEE80211_NODE_STAT(ni, tx_assoc);
2979 } else
2980 IEEE80211_NODE_STAT(ni, tx_assoc_fail);
2981 frm += 2;
2982
2983 frm = ieee80211_add_rates(frm, &ni->ni_rates);
2984 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
2985 /* NB: respond according to what we received */
2986 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) {
2987 frm = ieee80211_add_htcap(frm, ni);
2988 frm = ieee80211_add_htinfo(frm, ni);
2989 }
2990 if ((vap->iv_flags & IEEE80211_F_WME) &&
2991 ni->ni_ies.wme_ie != NULL)
2992 frm = ieee80211_add_wme_param(frm, &ic->ic_wme,
2993 !! (vap->iv_flags_ext & IEEE80211_FEXT_UAPSD));
2994 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) {
2995 frm = ieee80211_add_htcap_vendor(frm, ni);
2996 frm = ieee80211_add_htinfo_vendor(frm, ni);
2997 }
2998 if (ni->ni_flags & IEEE80211_NODE_VHT) {
2999 frm = ieee80211_add_vhtcap(frm, ni);
3000 frm = ieee80211_add_vhtinfo(frm, ni);
3001 }
3002 #ifdef IEEE80211_SUPPORT_SUPERG
3003 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS))
3004 frm = ieee80211_add_ath(frm,
3005 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS),
3006 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
3007 ni->ni_authmode != IEEE80211_AUTH_8021X) ?
3008 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
3009 #endif /* IEEE80211_SUPPORT_SUPERG */
3010 if (vap->iv_appie_assocresp != NULL)
3011 frm = add_appie(frm, vap->iv_appie_assocresp);
3012 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3013 break;
3014
3015 case IEEE80211_FC0_SUBTYPE_DISASSOC:
3016 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
3017 "send station disassociate (reason: %d (%s))", arg,
3018 ieee80211_reason_to_string(arg));
3019 m = ieee80211_getmgtframe(&frm,
3020 ic->ic_headroom + sizeof(struct ieee80211_frame),
3021 sizeof(uint16_t));
3022 if (m == NULL)
3023 senderr(ENOMEM, is_tx_nobuf);
3024 *(uint16_t *)frm = htole16(arg); /* reason */
3025 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
3026
3027 IEEE80211_NODE_STAT(ni, tx_disassoc);
3028 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg);
3029 break;
3030
3031 default:
3032 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
3033 "invalid mgmt frame type %u", type);
3034 senderr(EINVAL, is_tx_unknownmgt);
3035 /* NOTREACHED */
3036 }
3037
3038 /* NB: force non-ProbeResp frames to the highest queue */
3039 params.ibp_pri = WME_AC_VO;
3040 params.ibp_rate0 = bss->ni_txparms->mgmtrate;
3041 /* NB: we know all frames are unicast */
3042 params.ibp_try0 = bss->ni_txparms->maxretry;
3043 params.ibp_power = bss->ni_txpower;
3044 return ieee80211_mgmt_output(ni, m, type, ¶ms);
3045 bad:
3046 ieee80211_free_node(ni);
3047 return ret;
3048 #undef senderr
3049 #undef HTFLAGS
3050 }
3051
3052 /*
3053 * Return an mbuf with a probe response frame in it.
3054 * Space is left to prepend and 802.11 header at the
3055 * front but it's left to the caller to fill in.
3056 */
3057 struct mbuf *
ieee80211_alloc_proberesp(struct ieee80211_node * bss,int legacy)3058 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy)
3059 {
3060 struct ieee80211vap *vap = bss->ni_vap;
3061 struct ieee80211com *ic = bss->ni_ic;
3062 const struct ieee80211_rateset *rs;
3063 struct mbuf *m;
3064 uint16_t capinfo;
3065 uint8_t *frm;
3066
3067 /*
3068 * probe response frame format
3069 * [8] time stamp
3070 * [2] beacon interval
3071 * [2] cabability information
3072 * [tlv] ssid
3073 * [tlv] supported rates
3074 * [tlv] parameter set (FH/DS)
3075 * [tlv] parameter set (IBSS)
3076 * [tlv] country (optional)
3077 * [3] power control (optional)
3078 * [5] channel switch announcement (CSA) (optional)
3079 * [tlv] extended rate phy (ERP)
3080 * [tlv] extended supported rates
3081 * [tlv] RSN (optional)
3082 * [tlv] HT capabilities
3083 * [tlv] HT information
3084 * [tlv] VHT capabilities
3085 * [tlv] VHT information
3086 * [tlv] WPA (optional)
3087 * [tlv] WME (optional)
3088 * [tlv] Vendor OUI HT capabilities (optional)
3089 * [tlv] Vendor OUI HT information (optional)
3090 * [tlv] Atheros capabilities
3091 * [tlv] AppIE's (optional)
3092 * [tlv] Mesh ID (MBSS)
3093 * [tlv] Mesh Conf (MBSS)
3094 */
3095 m = ieee80211_getmgtframe(&frm,
3096 ic->ic_headroom + sizeof(struct ieee80211_frame),
3097 8
3098 + sizeof(uint16_t)
3099 + sizeof(uint16_t)
3100 + 2 + IEEE80211_NWID_LEN
3101 + 2 + IEEE80211_RATE_SIZE
3102 + 7 /* max(7,3) */
3103 + IEEE80211_COUNTRY_MAX_SIZE
3104 + 3
3105 + sizeof(struct ieee80211_csa_ie)
3106 + sizeof(struct ieee80211_quiet_ie)
3107 + 3
3108 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
3109 + sizeof(struct ieee80211_ie_wpa)
3110 + sizeof(struct ieee80211_ie_htcap)
3111 + sizeof(struct ieee80211_ie_htinfo)
3112 + sizeof(struct ieee80211_ie_wpa)
3113 + sizeof(struct ieee80211_wme_param)
3114 + 4 + sizeof(struct ieee80211_ie_htcap)
3115 + 4 + sizeof(struct ieee80211_ie_htinfo)
3116 + 2 + sizeof(struct ieee80211_vht_cap)
3117 + 2 + sizeof(struct ieee80211_vht_operation)
3118 #ifdef IEEE80211_SUPPORT_SUPERG
3119 + sizeof(struct ieee80211_ath_ie)
3120 #endif
3121 #ifdef IEEE80211_SUPPORT_MESH
3122 + 2 + IEEE80211_MESHID_LEN
3123 + sizeof(struct ieee80211_meshconf_ie)
3124 #endif
3125 + (vap->iv_appie_proberesp != NULL ?
3126 vap->iv_appie_proberesp->ie_len : 0)
3127 );
3128 if (m == NULL) {
3129 vap->iv_stats.is_tx_nobuf++;
3130 return NULL;
3131 }
3132
3133 memset(frm, 0, 8); /* timestamp should be filled later */
3134 frm += 8;
3135 *(uint16_t *)frm = htole16(bss->ni_intval);
3136 frm += 2;
3137 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan);
3138 *(uint16_t *)frm = htole16(capinfo);
3139 frm += 2;
3140
3141 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen);
3142 rs = ieee80211_get_suprates(ic, bss->ni_chan);
3143 frm = ieee80211_add_rates(frm, rs);
3144
3145 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) {
3146 *frm++ = IEEE80211_ELEMID_FHPARMS;
3147 *frm++ = 5;
3148 *frm++ = bss->ni_fhdwell & 0x00ff;
3149 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff;
3150 *frm++ = IEEE80211_FH_CHANSET(
3151 ieee80211_chan2ieee(ic, bss->ni_chan));
3152 *frm++ = IEEE80211_FH_CHANPAT(
3153 ieee80211_chan2ieee(ic, bss->ni_chan));
3154 *frm++ = bss->ni_fhindex;
3155 } else {
3156 *frm++ = IEEE80211_ELEMID_DSPARMS;
3157 *frm++ = 1;
3158 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan);
3159 }
3160
3161 if (vap->iv_opmode == IEEE80211_M_IBSS) {
3162 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
3163 *frm++ = 2;
3164 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
3165 }
3166 if ((vap->iv_flags & IEEE80211_F_DOTH) ||
3167 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD))
3168 frm = ieee80211_add_countryie(frm, ic);
3169 if (vap->iv_flags & IEEE80211_F_DOTH) {
3170 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan))
3171 frm = ieee80211_add_powerconstraint(frm, vap);
3172 if (ic->ic_flags & IEEE80211_F_CSAPENDING)
3173 frm = ieee80211_add_csa(frm, vap);
3174 }
3175 if (vap->iv_flags & IEEE80211_F_DOTH) {
3176 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
3177 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) {
3178 if (vap->iv_quiet)
3179 frm = ieee80211_add_quiet(frm, vap, 0);
3180 }
3181 }
3182 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan))
3183 frm = ieee80211_add_erp(frm, vap);
3184 frm = ieee80211_add_xrates(frm, rs);
3185 frm = ieee80211_add_rsn(frm, vap);
3186 /*
3187 * NB: legacy 11b clients do not get certain ie's.
3188 * The caller identifies such clients by passing
3189 * a token in legacy to us. Could expand this to be
3190 * any legacy client for stuff like HT ie's.
3191 */
3192 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) &&
3193 legacy != IEEE80211_SEND_LEGACY_11B) {
3194 frm = ieee80211_add_htcap(frm, bss);
3195 frm = ieee80211_add_htinfo(frm, bss);
3196 }
3197 if (IEEE80211_IS_CHAN_VHT(bss->ni_chan) &&
3198 legacy != IEEE80211_SEND_LEGACY_11B) {
3199 frm = ieee80211_add_vhtcap(frm, bss);
3200 frm = ieee80211_add_vhtinfo(frm, bss);
3201 }
3202 frm = ieee80211_add_wpa(frm, vap);
3203 if (vap->iv_flags & IEEE80211_F_WME)
3204 frm = ieee80211_add_wme_param(frm, &ic->ic_wme,
3205 !! (vap->iv_flags_ext & IEEE80211_FEXT_UAPSD));
3206 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) &&
3207 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) &&
3208 legacy != IEEE80211_SEND_LEGACY_11B) {
3209 frm = ieee80211_add_htcap_vendor(frm, bss);
3210 frm = ieee80211_add_htinfo_vendor(frm, bss);
3211 }
3212 #ifdef IEEE80211_SUPPORT_SUPERG
3213 if ((vap->iv_flags & IEEE80211_F_ATHEROS) &&
3214 legacy != IEEE80211_SEND_LEGACY_11B)
3215 frm = ieee80211_add_athcaps(frm, bss);
3216 #endif
3217 if (vap->iv_appie_proberesp != NULL)
3218 frm = add_appie(frm, vap->iv_appie_proberesp);
3219 #ifdef IEEE80211_SUPPORT_MESH
3220 if (vap->iv_opmode == IEEE80211_M_MBSS) {
3221 frm = ieee80211_add_meshid(frm, vap);
3222 frm = ieee80211_add_meshconf(frm, vap);
3223 }
3224 #endif
3225 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3226
3227 return m;
3228 }
3229
3230 /*
3231 * Send a probe response frame to the specified mac address.
3232 * This does not go through the normal mgt frame api so we
3233 * can specify the destination address and re-use the bss node
3234 * for the sta reference.
3235 */
3236 int
ieee80211_send_proberesp(struct ieee80211vap * vap,const uint8_t da[IEEE80211_ADDR_LEN],int legacy)3237 ieee80211_send_proberesp(struct ieee80211vap *vap,
3238 const uint8_t da[IEEE80211_ADDR_LEN], int legacy)
3239 {
3240 struct ieee80211_node *bss = vap->iv_bss;
3241 struct ieee80211com *ic = vap->iv_ic;
3242 struct mbuf *m;
3243 int ret;
3244
3245 if (vap->iv_state == IEEE80211_S_CAC) {
3246 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss,
3247 "block %s frame in CAC state", "probe response");
3248 vap->iv_stats.is_tx_badstate++;
3249 return EIO; /* XXX */
3250 }
3251
3252 /*
3253 * Hold a reference on the node so it doesn't go away until after
3254 * the xmit is complete all the way in the driver. On error we
3255 * will remove our reference.
3256 */
3257 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
3258 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
3259 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr),
3260 ieee80211_node_refcnt(bss)+1);
3261 ieee80211_ref_node(bss);
3262
3263 m = ieee80211_alloc_proberesp(bss, legacy);
3264 if (m == NULL) {
3265 ieee80211_free_node(bss);
3266 return ENOMEM;
3267 }
3268
3269 M_PREPEND(m, sizeof(struct ieee80211_frame), IEEE80211_M_NOWAIT);
3270 KASSERT(m != NULL, ("no room for header"));
3271
3272 IEEE80211_TX_LOCK(ic);
3273 ieee80211_send_setup(bss, m,
3274 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP,
3275 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid);
3276 /* XXX power management? */
3277 m->m_flags |= M_ENCAP; /* mark encapsulated */
3278
3279 M_WME_SETAC(m, WME_AC_BE);
3280
3281 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
3282 "send probe resp on channel %u to %s%s\n",
3283 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da),
3284 legacy ? " <legacy>" : "");
3285 IEEE80211_NODE_STAT(bss, tx_mgmt);
3286
3287 ret = ieee80211_raw_output(vap, bss, m, NULL);
3288 IEEE80211_TX_UNLOCK(ic);
3289 return (ret);
3290 }
3291
3292 /*
3293 * Allocate and build a RTS (Request To Send) control frame.
3294 */
3295 struct mbuf *
ieee80211_alloc_rts(struct ieee80211com * ic,const uint8_t ra[IEEE80211_ADDR_LEN],const uint8_t ta[IEEE80211_ADDR_LEN],uint16_t dur)3296 ieee80211_alloc_rts(struct ieee80211com *ic,
3297 const uint8_t ra[IEEE80211_ADDR_LEN],
3298 const uint8_t ta[IEEE80211_ADDR_LEN],
3299 uint16_t dur)
3300 {
3301 struct ieee80211_frame_rts *rts;
3302 struct mbuf *m;
3303
3304 /* XXX honor ic_headroom */
3305 m = m_gethdr(IEEE80211_M_NOWAIT, MT_DATA);
3306 if (m != NULL) {
3307 rts = mtod(m, struct ieee80211_frame_rts *);
3308 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 |
3309 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS;
3310 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
3311 *(u_int16_t *)rts->i_dur = htole16(dur);
3312 IEEE80211_ADDR_COPY(rts->i_ra, ra);
3313 IEEE80211_ADDR_COPY(rts->i_ta, ta);
3314
3315 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts);
3316 }
3317 return m;
3318 }
3319
3320 /*
3321 * Allocate and build a CTS (Clear To Send) control frame.
3322 */
3323 struct mbuf *
ieee80211_alloc_cts(struct ieee80211com * ic,const uint8_t ra[IEEE80211_ADDR_LEN],uint16_t dur)3324 ieee80211_alloc_cts(struct ieee80211com *ic,
3325 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur)
3326 {
3327 struct ieee80211_frame_cts *cts;
3328 struct mbuf *m;
3329
3330 /* XXX honor ic_headroom */
3331 m = m_gethdr(IEEE80211_M_NOWAIT, MT_DATA);
3332 if (m != NULL) {
3333 cts = mtod(m, struct ieee80211_frame_cts *);
3334 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 |
3335 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS;
3336 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
3337 *(u_int16_t *)cts->i_dur = htole16(dur);
3338 IEEE80211_ADDR_COPY(cts->i_ra, ra);
3339
3340 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts);
3341 }
3342 return m;
3343 }
3344
3345 /*
3346 * Wrapper for CTS/RTS frame allocation.
3347 */
3348 struct mbuf *
ieee80211_alloc_prot(struct ieee80211_node * ni,const struct mbuf * m,uint8_t rate,int prot)3349 ieee80211_alloc_prot(struct ieee80211_node *ni, const struct mbuf *m,
3350 uint8_t rate, int prot)
3351 {
3352 struct ieee80211com *ic = ni->ni_ic;
3353 struct ieee80211vap *vap = ni->ni_vap;
3354 const struct ieee80211_frame *wh;
3355 struct mbuf *mprot;
3356 uint16_t dur;
3357 int pktlen, isshort;
3358
3359 KASSERT(prot == IEEE80211_PROT_RTSCTS ||
3360 prot == IEEE80211_PROT_CTSONLY,
3361 ("wrong protection type %d", prot));
3362
3363 wh = mtod(m, const struct ieee80211_frame *);
3364 pktlen = m->m_pkthdr.len + IEEE80211_CRC_LEN;
3365 isshort = (vap->iv_flags & IEEE80211_F_SHPREAMBLE) != 0;
3366 dur = ieee80211_compute_duration(ic->ic_rt, pktlen, rate, isshort)
3367 + ieee80211_ack_duration(ic->ic_rt, rate, isshort);
3368
3369 if (prot == IEEE80211_PROT_RTSCTS) {
3370 /* NB: CTS is the same size as an ACK */
3371 dur += ieee80211_ack_duration(ic->ic_rt, rate, isshort);
3372 mprot = ieee80211_alloc_rts(ic, wh->i_addr1, wh->i_addr2, dur);
3373 } else
3374 mprot = ieee80211_alloc_cts(ic, vap->iv_myaddr, dur);
3375
3376 return (mprot);
3377 }
3378
3379 static void
ieee80211_tx_mgt_timeout(void * arg)3380 ieee80211_tx_mgt_timeout(void *arg)
3381 {
3382 struct ieee80211vap *vap = arg;
3383
3384 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
3385 "vap %p mode %s state %s flags %#x & %#x\n", vap,
3386 ieee80211_opmode_name[vap->iv_opmode],
3387 ieee80211_state_name[vap->iv_state],
3388 vap->iv_ic->ic_flags, IEEE80211_F_SCAN);
3389
3390 IEEE80211_LOCK(vap->iv_ic);
3391 if (vap->iv_state != IEEE80211_S_INIT &&
3392 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) {
3393 /*
3394 * NB: it's safe to specify a timeout as the reason here;
3395 * it'll only be used in the right state.
3396 */
3397 ieee80211_new_state_locked(vap, IEEE80211_S_SCAN,
3398 IEEE80211_SCAN_FAIL_TIMEOUT);
3399 }
3400 IEEE80211_UNLOCK(vap->iv_ic);
3401 }
3402
3403 /*
3404 * This is the callback set on net80211-sourced transmitted
3405 * authentication request frames.
3406 *
3407 * This does a couple of things:
3408 *
3409 * + If the frame transmitted was a success, it schedules a future
3410 * event which will transition the interface to scan.
3411 * If a state transition _then_ occurs before that event occurs,
3412 * said state transition will cancel this callout.
3413 *
3414 * + If the frame transmit was a failure, it immediately schedules
3415 * the transition back to scan.
3416 */
3417 static void
ieee80211_tx_mgt_cb(struct ieee80211_node * ni,void * arg,int status)3418 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status)
3419 {
3420 struct ieee80211vap *vap = ni->ni_vap;
3421 enum ieee80211_state ostate = (enum ieee80211_state)(uintptr_t)arg;
3422
3423 /*
3424 * Frame transmit completed; arrange timer callback. If
3425 * transmit was successfully we wait for response. Otherwise
3426 * we arrange an immediate callback instead of doing the
3427 * callback directly since we don't know what state the driver
3428 * is in (e.g. what locks it is holding). This work should
3429 * not be too time-critical and not happen too often so the
3430 * added overhead is acceptable.
3431 *
3432 * XXX what happens if !acked but response shows up before callback?
3433 */
3434 if (vap->iv_state == ostate) {
3435 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
3436 "ni %p mode %s state %s arg %p status %d\n", ni,
3437 ieee80211_opmode_name[vap->iv_opmode],
3438 ieee80211_state_name[vap->iv_state], arg, status);
3439
3440 callout_reset(&vap->iv_mgtsend,
3441 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0,
3442 ieee80211_tx_mgt_timeout, vap);
3443 }
3444 }
3445
3446 static void
ieee80211_beacon_construct(struct mbuf * m,uint8_t * frm,struct ieee80211_node * ni)3447 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm,
3448 struct ieee80211_node *ni)
3449 {
3450 struct ieee80211vap *vap = ni->ni_vap;
3451 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off;
3452 struct ieee80211com *ic = ni->ni_ic;
3453 struct ieee80211_rateset *rs = &ni->ni_rates;
3454 uint16_t capinfo;
3455
3456 /*
3457 * beacon frame format
3458 *
3459 * TODO: update to 802.11-2012; a lot of stuff has changed;
3460 * vendor extensions should be at the end, etc.
3461 *
3462 * [8] time stamp
3463 * [2] beacon interval
3464 * [2] cabability information
3465 * [tlv] ssid
3466 * [tlv] supported rates
3467 * [3] parameter set (DS)
3468 * [8] CF parameter set (optional)
3469 * [tlv] parameter set (IBSS/TIM)
3470 * [tlv] country (optional)
3471 * [3] power control (optional)
3472 * [5] channel switch announcement (CSA) (optional)
3473 * XXX TODO: Quiet
3474 * XXX TODO: IBSS DFS
3475 * XXX TODO: TPC report
3476 * [tlv] extended rate phy (ERP)
3477 * [tlv] extended supported rates
3478 * [tlv] RSN parameters
3479 * XXX TODO: BSSLOAD
3480 * (XXX EDCA parameter set, QoS capability?)
3481 * XXX TODO: AP channel report
3482 *
3483 * [tlv] HT capabilities
3484 * [tlv] HT information
3485 * XXX TODO: 20/40 BSS coexistence
3486 * Mesh:
3487 * XXX TODO: Meshid
3488 * XXX TODO: mesh config
3489 * XXX TODO: mesh awake window
3490 * XXX TODO: beacon timing (mesh, etc)
3491 * XXX TODO: MCCAOP Advertisement Overview
3492 * XXX TODO: MCCAOP Advertisement
3493 * XXX TODO: Mesh channel switch parameters
3494 * VHT:
3495 * XXX TODO: VHT capabilities
3496 * XXX TODO: VHT operation
3497 * XXX TODO: VHT transmit power envelope
3498 * XXX TODO: channel switch wrapper element
3499 * XXX TODO: extended BSS load element
3500 *
3501 * XXX Vendor-specific OIDs (e.g. Atheros)
3502 * [tlv] WPA parameters
3503 * [tlv] WME parameters
3504 * [tlv] Vendor OUI HT capabilities (optional)
3505 * [tlv] Vendor OUI HT information (optional)
3506 * [tlv] Atheros capabilities (optional)
3507 * [tlv] TDMA parameters (optional)
3508 * [tlv] Mesh ID (MBSS)
3509 * [tlv] Mesh Conf (MBSS)
3510 * [tlv] application data (optional)
3511 */
3512
3513 memset(bo, 0, sizeof(*bo));
3514
3515 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */
3516 frm += 8;
3517 *(uint16_t *)frm = htole16(ni->ni_intval);
3518 frm += 2;
3519 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
3520 bo->bo_caps = (uint16_t *)frm;
3521 *(uint16_t *)frm = htole16(capinfo);
3522 frm += 2;
3523 *frm++ = IEEE80211_ELEMID_SSID;
3524 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) {
3525 *frm++ = ni->ni_esslen;
3526 memcpy(frm, ni->ni_essid, ni->ni_esslen);
3527 frm += ni->ni_esslen;
3528 } else
3529 *frm++ = 0;
3530 frm = ieee80211_add_rates(frm, rs);
3531 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) {
3532 *frm++ = IEEE80211_ELEMID_DSPARMS;
3533 *frm++ = 1;
3534 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
3535 }
3536 if (ic->ic_flags & IEEE80211_F_PCF) {
3537 bo->bo_cfp = frm;
3538 frm = ieee80211_add_cfparms(frm, ic);
3539 }
3540 bo->bo_tim = frm;
3541 if (vap->iv_opmode == IEEE80211_M_IBSS) {
3542 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
3543 *frm++ = 2;
3544 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
3545 bo->bo_tim_len = 0;
3546 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
3547 vap->iv_opmode == IEEE80211_M_MBSS) {
3548 /* TIM IE is the same for Mesh and Hostap */
3549 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm;
3550
3551 tie->tim_ie = IEEE80211_ELEMID_TIM;
3552 tie->tim_len = 4; /* length */
3553 tie->tim_count = 0; /* DTIM count */
3554 tie->tim_period = vap->iv_dtim_period; /* DTIM period */
3555 tie->tim_bitctl = 0; /* bitmap control */
3556 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */
3557 frm += sizeof(struct ieee80211_tim_ie);
3558 bo->bo_tim_len = 1;
3559 }
3560 bo->bo_tim_trailer = frm;
3561 if ((vap->iv_flags & IEEE80211_F_DOTH) ||
3562 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD))
3563 frm = ieee80211_add_countryie(frm, ic);
3564 if (vap->iv_flags & IEEE80211_F_DOTH) {
3565 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan))
3566 frm = ieee80211_add_powerconstraint(frm, vap);
3567 bo->bo_csa = frm;
3568 if (ic->ic_flags & IEEE80211_F_CSAPENDING)
3569 frm = ieee80211_add_csa(frm, vap);
3570 } else
3571 bo->bo_csa = frm;
3572
3573 bo->bo_quiet = NULL;
3574 if (vap->iv_flags & IEEE80211_F_DOTH) {
3575 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
3576 (vap->iv_flags_ext & IEEE80211_FEXT_DFS) &&
3577 (vap->iv_quiet == 1)) {
3578 /*
3579 * We only insert the quiet IE offset if
3580 * the quiet IE is enabled. Otherwise don't
3581 * put it here or we'll just overwrite
3582 * some other beacon contents.
3583 */
3584 if (vap->iv_quiet) {
3585 bo->bo_quiet = frm;
3586 frm = ieee80211_add_quiet(frm,vap, 0);
3587 }
3588 }
3589 }
3590
3591 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) {
3592 bo->bo_erp = frm;
3593 frm = ieee80211_add_erp(frm, vap);
3594 }
3595 frm = ieee80211_add_xrates(frm, rs);
3596 frm = ieee80211_add_rsn(frm, vap);
3597 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) {
3598 frm = ieee80211_add_htcap(frm, ni);
3599 bo->bo_htinfo = frm;
3600 frm = ieee80211_add_htinfo(frm, ni);
3601 }
3602
3603 if (IEEE80211_IS_CHAN_VHT(ni->ni_chan)) {
3604 frm = ieee80211_add_vhtcap(frm, ni);
3605 bo->bo_vhtinfo = frm;
3606 frm = ieee80211_add_vhtinfo(frm, ni);
3607 /* Transmit power envelope */
3608 /* Channel switch wrapper element */
3609 /* Extended bss load element */
3610 }
3611
3612 frm = ieee80211_add_wpa(frm, vap);
3613 if (vap->iv_flags & IEEE80211_F_WME) {
3614 bo->bo_wme = frm;
3615 frm = ieee80211_add_wme_param(frm, &ic->ic_wme,
3616 !! (vap->iv_flags_ext & IEEE80211_FEXT_UAPSD));
3617 }
3618 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
3619 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) {
3620 frm = ieee80211_add_htcap_vendor(frm, ni);
3621 frm = ieee80211_add_htinfo_vendor(frm, ni);
3622 }
3623
3624 #ifdef IEEE80211_SUPPORT_SUPERG
3625 if (vap->iv_flags & IEEE80211_F_ATHEROS) {
3626 bo->bo_ath = frm;
3627 frm = ieee80211_add_athcaps(frm, ni);
3628 }
3629 #endif
3630 #ifdef IEEE80211_SUPPORT_TDMA
3631 if (vap->iv_caps & IEEE80211_C_TDMA) {
3632 bo->bo_tdma = frm;
3633 frm = ieee80211_add_tdma(frm, vap);
3634 }
3635 #endif
3636 if (vap->iv_appie_beacon != NULL) {
3637 bo->bo_appie = frm;
3638 bo->bo_appie_len = vap->iv_appie_beacon->ie_len;
3639 frm = add_appie(frm, vap->iv_appie_beacon);
3640 }
3641
3642 /* XXX TODO: move meshid/meshconf up to before vendor extensions? */
3643 #ifdef IEEE80211_SUPPORT_MESH
3644 if (vap->iv_opmode == IEEE80211_M_MBSS) {
3645 frm = ieee80211_add_meshid(frm, vap);
3646 bo->bo_meshconf = frm;
3647 frm = ieee80211_add_meshconf(frm, vap);
3648 }
3649 #endif
3650 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer;
3651 bo->bo_csa_trailer_len = frm - bo->bo_csa;
3652 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3653 }
3654
3655 /*
3656 * Allocate a beacon frame and fillin the appropriate bits.
3657 */
3658 struct mbuf *
ieee80211_beacon_alloc(struct ieee80211_node * ni)3659 ieee80211_beacon_alloc(struct ieee80211_node *ni)
3660 {
3661 struct ieee80211vap *vap = ni->ni_vap;
3662 struct ieee80211com *ic = ni->ni_ic;
3663 struct ifnet *ifp = vap->iv_ifp;
3664 struct ieee80211_frame *wh;
3665 struct mbuf *m;
3666 int pktlen;
3667 uint8_t *frm;
3668
3669 /*
3670 * Update the "We're putting the quiet IE in the beacon" state.
3671 */
3672 if (vap->iv_quiet == 1)
3673 vap->iv_flags_ext |= IEEE80211_FEXT_QUIET_IE;
3674 else if (vap->iv_quiet == 0)
3675 vap->iv_flags_ext &= ~IEEE80211_FEXT_QUIET_IE;
3676
3677 /*
3678 * beacon frame format
3679 *
3680 * Note: This needs updating for 802.11-2012.
3681 *
3682 * [8] time stamp
3683 * [2] beacon interval
3684 * [2] cabability information
3685 * [tlv] ssid
3686 * [tlv] supported rates
3687 * [3] parameter set (DS)
3688 * [8] CF parameter set (optional)
3689 * [tlv] parameter set (IBSS/TIM)
3690 * [tlv] country (optional)
3691 * [3] power control (optional)
3692 * [5] channel switch announcement (CSA) (optional)
3693 * [tlv] extended rate phy (ERP)
3694 * [tlv] extended supported rates
3695 * [tlv] RSN parameters
3696 * [tlv] HT capabilities
3697 * [tlv] HT information
3698 * [tlv] VHT capabilities
3699 * [tlv] VHT operation
3700 * [tlv] Vendor OUI HT capabilities (optional)
3701 * [tlv] Vendor OUI HT information (optional)
3702 * XXX Vendor-specific OIDs (e.g. Atheros)
3703 * [tlv] WPA parameters
3704 * [tlv] WME parameters
3705 * [tlv] TDMA parameters (optional)
3706 * [tlv] Mesh ID (MBSS)
3707 * [tlv] Mesh Conf (MBSS)
3708 * [tlv] application data (optional)
3709 * NB: we allocate the max space required for the TIM bitmap.
3710 * XXX how big is this?
3711 */
3712 pktlen = 8 /* time stamp */
3713 + sizeof(uint16_t) /* beacon interval */
3714 + sizeof(uint16_t) /* capabilities */
3715 + 2 + ni->ni_esslen /* ssid */
3716 + 2 + IEEE80211_RATE_SIZE /* supported rates */
3717 + 2 + 1 /* DS parameters */
3718 + 2 + 6 /* CF parameters */
3719 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */
3720 + IEEE80211_COUNTRY_MAX_SIZE /* country */
3721 + 2 + 1 /* power control */
3722 + sizeof(struct ieee80211_csa_ie) /* CSA */
3723 + sizeof(struct ieee80211_quiet_ie) /* Quiet */
3724 + 2 + 1 /* ERP */
3725 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
3726 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */
3727 2*sizeof(struct ieee80211_ie_wpa) : 0)
3728 /* XXX conditional? */
3729 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */
3730 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */
3731 + 2 + sizeof(struct ieee80211_vht_cap)/* VHT caps */
3732 + 2 + sizeof(struct ieee80211_vht_operation)/* VHT info */
3733 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */
3734 sizeof(struct ieee80211_wme_param) : 0)
3735 #ifdef IEEE80211_SUPPORT_SUPERG
3736 + sizeof(struct ieee80211_ath_ie) /* ATH */
3737 #endif
3738 #ifdef IEEE80211_SUPPORT_TDMA
3739 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */
3740 sizeof(struct ieee80211_tdma_param) : 0)
3741 #endif
3742 #ifdef IEEE80211_SUPPORT_MESH
3743 + 2 + ni->ni_meshidlen
3744 + sizeof(struct ieee80211_meshconf_ie)
3745 #endif
3746 + IEEE80211_MAX_APPIE
3747 ;
3748 m = ieee80211_getmgtframe(&frm,
3749 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen);
3750 if (m == NULL) {
3751 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
3752 "%s: cannot get buf; size %u\n", __func__, pktlen);
3753 vap->iv_stats.is_tx_nobuf++;
3754 return NULL;
3755 }
3756 ieee80211_beacon_construct(m, frm, ni);
3757
3758 M_PREPEND(m, sizeof(struct ieee80211_frame), IEEE80211_M_NOWAIT);
3759 KASSERT(m != NULL, ("no space for 802.11 header?"));
3760 wh = mtod(m, struct ieee80211_frame *);
3761 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
3762 IEEE80211_FC0_SUBTYPE_BEACON;
3763 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
3764 *(uint16_t *)wh->i_dur = 0;
3765 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr);
3766 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
3767 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
3768 *(uint16_t *)wh->i_seq = 0;
3769
3770 return m;
3771 }
3772
3773 /*
3774 * Update the dynamic parts of a beacon frame based on the current state.
3775 */
3776 int
ieee80211_beacon_update(struct ieee80211_node * ni,struct mbuf * m,int mcast)3777 ieee80211_beacon_update(struct ieee80211_node *ni, struct mbuf *m, int mcast)
3778 {
3779 struct ieee80211vap *vap = ni->ni_vap;
3780 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off;
3781 struct ieee80211com *ic = ni->ni_ic;
3782 int len_changed = 0;
3783 uint16_t capinfo;
3784 struct ieee80211_frame *wh;
3785 ieee80211_seq seqno;
3786
3787 IEEE80211_LOCK(ic);
3788 /*
3789 * Handle 11h channel change when we've reached the count.
3790 * We must recalculate the beacon frame contents to account
3791 * for the new channel. Note we do this only for the first
3792 * vap that reaches this point; subsequent vaps just update
3793 * their beacon state to reflect the recalculated channel.
3794 */
3795 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) &&
3796 vap->iv_csa_count == ic->ic_csa_count) {
3797 vap->iv_csa_count = 0;
3798 /*
3799 * Effect channel change before reconstructing the beacon
3800 * frame contents as many places reference ni_chan.
3801 */
3802 if (ic->ic_csa_newchan != NULL)
3803 ieee80211_csa_completeswitch(ic);
3804 /*
3805 * NB: ieee80211_beacon_construct clears all pending
3806 * updates in bo_flags so we don't need to explicitly
3807 * clear IEEE80211_BEACON_CSA.
3808 */
3809 ieee80211_beacon_construct(m,
3810 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), ni);
3811
3812 /* XXX do WME aggressive mode processing? */
3813 IEEE80211_UNLOCK(ic);
3814 return 1; /* just assume length changed */
3815 }
3816
3817 /*
3818 * Handle the quiet time element being added and removed.
3819 * Again, for now we just cheat and reconstruct the whole
3820 * beacon - that way the gap is provided as appropriate.
3821 *
3822 * So, track whether we have already added the IE versus
3823 * whether we want to be adding the IE.
3824 */
3825 if ((vap->iv_flags_ext & IEEE80211_FEXT_QUIET_IE) &&
3826 (vap->iv_quiet == 0)) {
3827 /*
3828 * Quiet time beacon IE enabled, but it's disabled;
3829 * recalc
3830 */
3831 vap->iv_flags_ext &= ~IEEE80211_FEXT_QUIET_IE;
3832 ieee80211_beacon_construct(m,
3833 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), ni);
3834 /* XXX do WME aggressive mode processing? */
3835 IEEE80211_UNLOCK(ic);
3836 return 1; /* just assume length changed */
3837 }
3838
3839 if (((vap->iv_flags_ext & IEEE80211_FEXT_QUIET_IE) == 0) &&
3840 (vap->iv_quiet == 1)) {
3841 /*
3842 * Quiet time beacon IE disabled, but it's now enabled;
3843 * recalc
3844 */
3845 vap->iv_flags_ext |= IEEE80211_FEXT_QUIET_IE;
3846 ieee80211_beacon_construct(m,
3847 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), ni);
3848 /* XXX do WME aggressive mode processing? */
3849 IEEE80211_UNLOCK(ic);
3850 return 1; /* just assume length changed */
3851 }
3852
3853 wh = mtod(m, struct ieee80211_frame *);
3854
3855 /*
3856 * XXX TODO Strictly speaking this should be incremented with the TX
3857 * lock held so as to serialise access to the non-qos TID sequence
3858 * number space.
3859 *
3860 * If the driver identifies it does its own TX seqno management then
3861 * we can skip this (and still not do the TX seqno.)
3862 */
3863 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
3864 *(uint16_t *)&wh->i_seq[0] =
3865 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
3866 M_SEQNO_SET(m, seqno);
3867
3868 /* XXX faster to recalculate entirely or just changes? */
3869 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
3870 *bo->bo_caps = htole16(capinfo);
3871
3872 if (vap->iv_flags & IEEE80211_F_WME) {
3873 struct ieee80211_wme_state *wme = &ic->ic_wme;
3874
3875 /*
3876 * Check for aggressive mode change. When there is
3877 * significant high priority traffic in the BSS
3878 * throttle back BE traffic by using conservative
3879 * parameters. Otherwise BE uses aggressive params
3880 * to optimize performance of legacy/non-QoS traffic.
3881 */
3882 if (wme->wme_flags & WME_F_AGGRMODE) {
3883 if (wme->wme_hipri_traffic >
3884 wme->wme_hipri_switch_thresh) {
3885 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
3886 "%s: traffic %u, disable aggressive mode\n",
3887 __func__, wme->wme_hipri_traffic);
3888 wme->wme_flags &= ~WME_F_AGGRMODE;
3889 ieee80211_wme_updateparams_locked(vap);
3890 wme->wme_hipri_traffic =
3891 wme->wme_hipri_switch_hysteresis;
3892 } else
3893 wme->wme_hipri_traffic = 0;
3894 } else {
3895 if (wme->wme_hipri_traffic <=
3896 wme->wme_hipri_switch_thresh) {
3897 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
3898 "%s: traffic %u, enable aggressive mode\n",
3899 __func__, wme->wme_hipri_traffic);
3900 wme->wme_flags |= WME_F_AGGRMODE;
3901 ieee80211_wme_updateparams_locked(vap);
3902 wme->wme_hipri_traffic = 0;
3903 } else
3904 wme->wme_hipri_traffic =
3905 wme->wme_hipri_switch_hysteresis;
3906 }
3907 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) {
3908 (void) ieee80211_add_wme_param(bo->bo_wme, wme,
3909 vap->iv_flags_ext & IEEE80211_FEXT_UAPSD);
3910 clrbit(bo->bo_flags, IEEE80211_BEACON_WME);
3911 }
3912 }
3913
3914 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) {
3915 ieee80211_ht_update_beacon(vap, bo);
3916 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO);
3917 }
3918 #ifdef IEEE80211_SUPPORT_TDMA
3919 if (vap->iv_caps & IEEE80211_C_TDMA) {
3920 /*
3921 * NB: the beacon is potentially updated every TBTT.
3922 */
3923 ieee80211_tdma_update_beacon(vap, bo);
3924 }
3925 #endif
3926 #ifdef IEEE80211_SUPPORT_MESH
3927 if (vap->iv_opmode == IEEE80211_M_MBSS)
3928 ieee80211_mesh_update_beacon(vap, bo);
3929 #endif
3930
3931 if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
3932 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/
3933 struct ieee80211_tim_ie *tie =
3934 (struct ieee80211_tim_ie *) bo->bo_tim;
3935 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) {
3936 u_int timlen, timoff, i;
3937 /*
3938 * ATIM/DTIM needs updating. If it fits in the
3939 * current space allocated then just copy in the
3940 * new bits. Otherwise we need to move any trailing
3941 * data to make room. Note that we know there is
3942 * contiguous space because ieee80211_beacon_allocate
3943 * insures there is space in the mbuf to write a
3944 * maximal-size virtual bitmap (based on iv_max_aid).
3945 */
3946 /*
3947 * Calculate the bitmap size and offset, copy any
3948 * trailer out of the way, and then copy in the
3949 * new bitmap and update the information element.
3950 * Note that the tim bitmap must contain at least
3951 * one byte and any offset must be even.
3952 */
3953 if (vap->iv_ps_pending != 0) {
3954 timoff = 128; /* impossibly large */
3955 for (i = 0; i < vap->iv_tim_len; i++)
3956 if (vap->iv_tim_bitmap[i]) {
3957 timoff = i &~ 1;
3958 break;
3959 }
3960 KASSERT(timoff != 128, ("tim bitmap empty!"));
3961 for (i = vap->iv_tim_len-1; i >= timoff; i--)
3962 if (vap->iv_tim_bitmap[i])
3963 break;
3964 timlen = 1 + (i - timoff);
3965 } else {
3966 timoff = 0;
3967 timlen = 1;
3968 }
3969
3970 /*
3971 * TODO: validate this!
3972 */
3973 if (timlen != bo->bo_tim_len) {
3974 /* copy up/down trailer */
3975 int adjust = tie->tim_bitmap+timlen
3976 - bo->bo_tim_trailer;
3977 ovbcopy(bo->bo_tim_trailer,
3978 bo->bo_tim_trailer+adjust,
3979 bo->bo_tim_trailer_len);
3980 bo->bo_tim_trailer += adjust;
3981 bo->bo_erp += adjust;
3982 bo->bo_htinfo += adjust;
3983 bo->bo_vhtinfo += adjust;
3984 #ifdef IEEE80211_SUPPORT_SUPERG
3985 bo->bo_ath += adjust;
3986 #endif
3987 #ifdef IEEE80211_SUPPORT_TDMA
3988 bo->bo_tdma += adjust;
3989 #endif
3990 #ifdef IEEE80211_SUPPORT_MESH
3991 bo->bo_meshconf += adjust;
3992 #endif
3993 bo->bo_appie += adjust;
3994 bo->bo_wme += adjust;
3995 bo->bo_csa += adjust;
3996 bo->bo_quiet += adjust;
3997 bo->bo_tim_len = timlen;
3998
3999 /* update information element */
4000 tie->tim_len = 3 + timlen;
4001 tie->tim_bitctl = timoff;
4002 len_changed = 1;
4003 }
4004 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff,
4005 bo->bo_tim_len);
4006
4007 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM);
4008
4009 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
4010 "%s: TIM updated, pending %u, off %u, len %u\n",
4011 __func__, vap->iv_ps_pending, timoff, timlen);
4012 }
4013 /* count down DTIM period */
4014 if (tie->tim_count == 0)
4015 tie->tim_count = tie->tim_period - 1;
4016 else
4017 tie->tim_count--;
4018 /* update state for buffered multicast frames on DTIM */
4019 if (mcast && tie->tim_count == 0)
4020 tie->tim_bitctl |= 1;
4021 else
4022 tie->tim_bitctl &= ~1;
4023 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) {
4024 struct ieee80211_csa_ie *csa =
4025 (struct ieee80211_csa_ie *) bo->bo_csa;
4026
4027 /*
4028 * Insert or update CSA ie. If we're just starting
4029 * to count down to the channel switch then we need
4030 * to insert the CSA ie. Otherwise we just need to
4031 * drop the count. The actual change happens above
4032 * when the vap's count reaches the target count.
4033 */
4034 if (vap->iv_csa_count == 0) {
4035 memmove(&csa[1], csa, bo->bo_csa_trailer_len);
4036 bo->bo_erp += sizeof(*csa);
4037 bo->bo_htinfo += sizeof(*csa);
4038 bo->bo_vhtinfo += sizeof(*csa);
4039 bo->bo_wme += sizeof(*csa);
4040 #ifdef IEEE80211_SUPPORT_SUPERG
4041 bo->bo_ath += sizeof(*csa);
4042 #endif
4043 #ifdef IEEE80211_SUPPORT_TDMA
4044 bo->bo_tdma += sizeof(*csa);
4045 #endif
4046 #ifdef IEEE80211_SUPPORT_MESH
4047 bo->bo_meshconf += sizeof(*csa);
4048 #endif
4049 bo->bo_appie += sizeof(*csa);
4050 bo->bo_csa_trailer_len += sizeof(*csa);
4051 bo->bo_quiet += sizeof(*csa);
4052 bo->bo_tim_trailer_len += sizeof(*csa);
4053 m->m_len += sizeof(*csa);
4054 m->m_pkthdr.len += sizeof(*csa);
4055
4056 ieee80211_add_csa(bo->bo_csa, vap);
4057 } else
4058 csa->csa_count--;
4059 vap->iv_csa_count++;
4060 /* NB: don't clear IEEE80211_BEACON_CSA */
4061 }
4062
4063 /*
4064 * Only add the quiet time IE if we've enabled it
4065 * as appropriate.
4066 */
4067 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
4068 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) {
4069 if (vap->iv_quiet &&
4070 (vap->iv_flags_ext & IEEE80211_FEXT_QUIET_IE)) {
4071 ieee80211_add_quiet(bo->bo_quiet, vap, 1);
4072 }
4073 }
4074 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) {
4075 /*
4076 * ERP element needs updating.
4077 */
4078 (void) ieee80211_add_erp(bo->bo_erp, vap);
4079 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP);
4080 }
4081 #ifdef IEEE80211_SUPPORT_SUPERG
4082 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) {
4083 ieee80211_add_athcaps(bo->bo_ath, ni);
4084 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH);
4085 }
4086 #endif
4087 }
4088 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) {
4089 const struct ieee80211_appie *aie = vap->iv_appie_beacon;
4090 int aielen;
4091 uint8_t *frm;
4092
4093 aielen = 0;
4094 if (aie != NULL)
4095 aielen += aie->ie_len;
4096 if (aielen != bo->bo_appie_len) {
4097 /* copy up/down trailer */
4098 int adjust = aielen - bo->bo_appie_len;
4099 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust,
4100 bo->bo_tim_trailer_len);
4101 bo->bo_tim_trailer += adjust;
4102 bo->bo_appie += adjust;
4103 bo->bo_appie_len = aielen;
4104
4105 len_changed = 1;
4106 }
4107 frm = bo->bo_appie;
4108 if (aie != NULL)
4109 frm = add_appie(frm, aie);
4110 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE);
4111 }
4112 IEEE80211_UNLOCK(ic);
4113
4114 return len_changed;
4115 }
4116
4117 /*
4118 * Do Ethernet-LLC encapsulation for each payload in a fast frame
4119 * tunnel encapsulation. The frame is assumed to have an Ethernet
4120 * header at the front that must be stripped before prepending the
4121 * LLC followed by the Ethernet header passed in (with an Ethernet
4122 * type that specifies the payload size).
4123 */
4124 struct mbuf *
ieee80211_ff_encap1(struct ieee80211vap * vap,struct mbuf * m,const struct ether_header * eh)4125 ieee80211_ff_encap1(struct ieee80211vap *vap, struct mbuf *m,
4126 const struct ether_header *eh)
4127 {
4128 struct llc *llc;
4129 uint16_t payload;
4130
4131 /* XXX optimize by combining m_adj+M_PREPEND */
4132 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
4133 llc = mtod(m, struct llc *);
4134 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
4135 llc->llc_control = LLC_UI;
4136 llc->llc_snap.org_code[0] = 0;
4137 llc->llc_snap.org_code[1] = 0;
4138 llc->llc_snap.org_code[2] = 0;
4139 llc->llc_snap.ether_type = eh->ether_type;
4140 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */
4141
4142 M_PREPEND(m, sizeof(struct ether_header), IEEE80211_M_NOWAIT);
4143 if (m == NULL) { /* XXX cannot happen */
4144 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
4145 "%s: no space for ether_header\n", __func__);
4146 vap->iv_stats.is_tx_nobuf++;
4147 return NULL;
4148 }
4149 ETHER_HEADER_COPY(mtod(m, void *), eh);
4150 mtod(m, struct ether_header *)->ether_type = htons(payload);
4151 return m;
4152 }
4153
4154 /*
4155 * Complete an mbuf transmission.
4156 *
4157 * For now, this simply processes a completed frame after the
4158 * driver has completed it's transmission and/or retransmission.
4159 * It assumes the frame is an 802.11 encapsulated frame.
4160 *
4161 * Later on it will grow to become the exit path for a given frame
4162 * from the driver and, depending upon how it's been encapsulated
4163 * and already transmitted, it may end up doing A-MPDU retransmission,
4164 * power save requeuing, etc.
4165 *
4166 * In order for the above to work, the driver entry point to this
4167 * must not hold any driver locks. Thus, the driver needs to delay
4168 * any actual mbuf completion until it can release said locks.
4169 *
4170 * This frees the mbuf and if the mbuf has a node reference,
4171 * the node reference will be freed.
4172 */
4173 void
ieee80211_tx_complete(struct ieee80211_node * ni,struct mbuf * m,int status)4174 ieee80211_tx_complete(struct ieee80211_node *ni, struct mbuf *m, int status)
4175 {
4176
4177 if (ni != NULL) {
4178 struct ifnet *ifp = ni->ni_vap->iv_ifp;
4179
4180 if (status == 0) {
4181 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
4182 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
4183 if (m->m_flags & M_MCAST)
4184 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
4185 } else
4186 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
4187 if (m->m_flags & M_TXCB) {
4188 IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
4189 "ni %p vap %p mode %s state %s m %p status %d\n", ni, ni->ni_vap,
4190 ieee80211_opmode_name[ni->ni_vap->iv_opmode],
4191 ieee80211_state_name[ni->ni_vap->iv_state], m, status);
4192 ieee80211_process_callback(ni, m, status);
4193 }
4194 ieee80211_free_node(ni);
4195 }
4196 m_freem(m);
4197 }
4198